https://wccftech.com/google-docs-will-soon-support-emoji-reactions-in-documents/

Emoji reactions are nothing new, to be honest. As a matter of fact, they have become an integral part of most of the apps like Slack, Instagram, Messenger, iMessage, and even WhatsApp joining the bandwagon soon. However, the next app to support emoji reactions is rather unconventional as Google has announced that Google Docs is now joining the party.

Google Docs on the web will soon let you leave emoji reactions in documents. At the moment, the service only lets you add a comment on documents but that is going to change now as you will be able to leave thumbs up, fire, or any other emoji that you wish to do so.