Adding any emoji as a reaction remains under review.
I am marking this as partially done to let you know a new reactions bar with Like, Heart, Laugh, Surprised, Sad, and Angry has begun rolling out to all users.
We’re updating our command library all the time, so keep checking the menu in the command box to see what’s new by typing / or @.
This item remains on the backlog.
Thank you for your feedback. The team is currently planning for this work, we will share an update as soon as one is available.