diff --git a/lib/shared/inline-engagement-utils.js b/lib/shared/inline-engagement-utils.js
index 67b2cc686..2a121bef6 100644
--- a/lib/shared/inline-engagement-utils.js
+++ b/lib/shared/inline-engagement-utils.js
@@ -1,13 +1,25 @@
 // @flow
 
+import type { ReactionInfo } from '../selectors/chat-selectors.js';
 import type { ThreadInfo } from '../types/thread-types.js';
 
 function getInlineEngagementSidebarText(threadInfo: ?ThreadInfo): string {
   if (!threadInfo) {
     return '';
   }
   const repliesCount = threadInfo.repliesCount || 1;
   return `${repliesCount} ${repliesCount > 1 ? 'replies' : 'reply'}`;
 }
 
-export { getInlineEngagementSidebarText };
+function reactionsToRawString(reactions: ReactionInfo): string {
+  const reactionStringParts = [];
+
+  for (const reaction in reactions) {
+    const reactionInfo = reactions[reaction];
+    reactionStringParts.push(`${reaction}${reactionInfo.users.length}`);
+  }
+
+  return reactionStringParts.join('');
+}
+
+export { getInlineEngagementSidebarText, reactionsToRawString };
diff --git a/native/chat/chat-item-height-measurer.react.js b/native/chat/chat-item-height-measurer.react.js
index a5d2d139d..e616b8cac 100644
--- a/native/chat/chat-item-height-measurer.react.js
+++ b/native/chat/chat-item-height-measurer.react.js
@@ -1,192 +1,199 @@
 // @flow
 
 import invariant from 'invariant';
 import * as React from 'react';
 
+import {
+  getInlineEngagementSidebarText,
+  reactionsToRawString,
+} from 'lib/shared/inline-engagement-utils.js';
 import { messageID } from 'lib/shared/message-utils.js';
 import {
   messageTypes,
   type MessageType,
 } from 'lib/types/message-types-enum.js';
 import { entityTextToRawString } from 'lib/utils/entity-text.js';
 
 import type { MeasurementTask } from './chat-context-provider.react.js';
 import { useComposedMessageMaxWidth } from './composed-message-width.js';
 import { dummyNodeForRobotextMessageHeightMeasurement } from './inner-robotext-message.react.js';
 import { dummyNodeForTextMessageHeightMeasurement } from './inner-text-message.react.js';
 import type { NativeChatMessageItem } from './message-data.react.js';
 import { MessageListContextProvider } from './message-list-types.js';
 import { multimediaMessageContentSizes } from './multimedia-message-utils.js';
 import { chatMessageItemKey } from './utils.js';
 import NodeHeightMeasurer from '../components/node-height-measurer.react.js';
 import { InputStateContext } from '../input/input-state.js';
 
 type Props = {
   +measurement: MeasurementTask,
 };
 
 const heightMeasurerKey = (item: NativeChatMessageItem) => {
   if (item.itemType !== 'message') {
     return null;
   }
-  const { messageInfo } = item;
+  const { messageInfo, threadCreatedFromMessage, reactions } = item;
+
   if (messageInfo.type === messageTypes.TEXT) {
     return JSON.stringify({ text: messageInfo.text });
   } else if (item.robotext) {
     const { threadID } = item.messageInfo;
     return JSON.stringify({
       robotext: entityTextToRawString(item.robotext, { threadID }),
+      sidebar: getInlineEngagementSidebarText(threadCreatedFromMessage),
+      reactions: reactionsToRawString(reactions),
     });
   }
   return null;
 };
 
 // ESLint doesn't recognize that invariant always throws
 // eslint-disable-next-line consistent-return
 const heightMeasurerDummy = (item: NativeChatMessageItem) => {
   invariant(
     item.itemType === 'message',
     'NodeHeightMeasurer asked for dummy for non-message item',
   );
   const { messageInfo } = item;
   if (messageInfo.type === messageTypes.TEXT) {
     return dummyNodeForTextMessageHeightMeasurement(messageInfo.text);
   } else if (item.robotext) {
     return dummyNodeForRobotextMessageHeightMeasurement(
       item.robotext,
       item.messageInfo.threadID,
       item.threadCreatedFromMessage,
       item.reactions,
     );
   }
   invariant(false, 'NodeHeightMeasurer asked for dummy for non-text message');
 };
 
 function ChatItemHeightMeasurer(props: Props) {
   const composedMessageMaxWidth = useComposedMessageMaxWidth();
   const inputState = React.useContext(InputStateContext);
   const inputStatePendingUploads = inputState?.pendingUploads;
 
   const { measurement } = props;
   const { threadInfo } = measurement;
   const heightMeasurerMergeItem = React.useCallback(
     (item: NativeChatMessageItem, height: ?number) => {
       if (item.itemType !== 'message') {
         return item;
       }
 
       const { messageInfo } = item;
       const messageType: MessageType = messageInfo.type;
       invariant(
         messageType !== messageTypes.SIDEBAR_SOURCE,
         'Sidebar source messages should be replaced by sourceMessage before being measured',
       );
 
       if (
         messageInfo.type === messageTypes.IMAGES ||
         messageInfo.type === messageTypes.MULTIMEDIA
       ) {
         // Conditional due to Flow...
         const localMessageInfo = item.localMessageInfo
           ? item.localMessageInfo
           : null;
         const id = messageID(messageInfo);
         const pendingUploads = inputStatePendingUploads?.[id];
         const sizes = multimediaMessageContentSizes(
           messageInfo,
           composedMessageMaxWidth,
         );
         return {
           itemType: 'message',
           messageShapeType: 'multimedia',
           messageInfo,
           localMessageInfo,
           threadInfo,
           startsConversation: item.startsConversation,
           startsCluster: item.startsCluster,
           endsCluster: item.endsCluster,
           threadCreatedFromMessage: item.threadCreatedFromMessage,
           pendingUploads,
           reactions: item.reactions,
           hasBeenEdited: item.hasBeenEdited,
           isPinned: item.isPinned,
           ...sizes,
         };
       }
 
       invariant(
         height !== null && height !== undefined,
         'height should be set',
       );
       if (messageInfo.type === messageTypes.TEXT) {
         // Conditional due to Flow...
         const localMessageInfo = item.localMessageInfo
           ? item.localMessageInfo
           : null;
         return {
           itemType: 'message',
           messageShapeType: 'text',
           messageInfo,
           localMessageInfo,
           threadInfo,
           startsConversation: item.startsConversation,
           startsCluster: item.startsCluster,
           endsCluster: item.endsCluster,
           threadCreatedFromMessage: item.threadCreatedFromMessage,
           contentHeight: height,
           reactions: item.reactions,
           hasBeenEdited: item.hasBeenEdited,
           isPinned: item.isPinned,
         };
       }
       invariant(
         item.messageInfoType !== 'composable',
         'ChatItemHeightMeasurer was handed a messageInfoType=composable, but ' +
           `does not know how to handle MessageType ${messageInfo.type}`,
       );
       invariant(
         item.messageInfoType === 'robotext',
         'ChatItemHeightMeasurer was handed a messageInfoType that it does ' +
           `not recognize: ${item.messageInfoType}`,
       );
       return {
         itemType: 'message',
         messageShapeType: 'robotext',
         messageInfo,
         threadInfo,
         startsConversation: item.startsConversation,
         startsCluster: item.startsCluster,
         endsCluster: item.endsCluster,
         threadCreatedFromMessage: item.threadCreatedFromMessage,
         robotext: item.robotext,
         contentHeight: height,
         reactions: item.reactions,
       };
     },
     [composedMessageMaxWidth, inputStatePendingUploads, threadInfo],
   );
 
   return (
     <MessageListContextProvider
       threadInfo={threadInfo}
       key={measurement.measurerID}
     >
       <NodeHeightMeasurer
         listData={measurement.messages}
         itemToID={chatMessageItemKey}
         itemToMeasureKey={heightMeasurerKey}
         itemToDummy={heightMeasurerDummy}
         mergeItemWithHeight={heightMeasurerMergeItem}
         allHeightsMeasured={measurement.onMessagesMeasured}
         inputState={inputState}
         composedMessageMaxWidth={composedMessageMaxWidth}
         initialMeasuredHeights={measurement.initialMeasuredHeights}
       />
     </MessageListContextProvider>
   );
 }
 
 const MemoizedChatItemHeightMeasurer: React.ComponentType<Props> =
   React.memo<Props>(ChatItemHeightMeasurer);
 
 export default MemoizedChatItemHeightMeasurer;