https://wccftech.com/imessage-reactions-are-now-rolling-out-to-more-google-messages-users/

We have good news for everyone who is still using Google Messages as iMessage reactions are finally rolling out to more users. Google was testing a feature in the past that would convert iMessage reactions into the appropriate emoji on an Android device, and while it was only available to limited users at that time, it is finally rolling out to more users.

According to reports from various users, Google Messages has received a beta update that finally supports iMessage reactions. Users are seeing this feature in the Google Messages version 20220121_02_RC00. The new update also adds a toggle in Settings > Advanced > Show iPhone reactions as emoji to let you enable or disable this feature.