Google is working on bringing a new feature to Google Messages, which will convert the iMessage reactions as an emoji in the message. This new feature is discovered by 9to5Google in the recent APK teardown of the beta build of the app. This feature will turn the iMessage reactions, frequently found in group chats in into emojis, since, cross-platform is generally not a thing for Apple.
There is a new preference, called ios_reaction_classification which has a description, stating it as Show iPhone reactions as emoji. But as of now, the feature is not yet active but may go live in a few days or weeks.
Another feature, where Google will let you know whose birthday is it in the group chat or a particular person in the chat. This, however, will be dependent on that person’s particulars saved in Google Contacts. Messages will show a banner in case its birthday of the person you are chatting with.