Looks like this is one of those longstanding feature requests, linked above. It would seem the best that can be done currently is to rely on group names, but these aren't editable and therefore potentially obsolete. If there's doubt about whether a certain user is part of a group, the user's groups can be viewed on their JIRA profile, but you'll only see groups of which you're also a member, as described here. (A user may be a member of other groups that you don't have permission to know about.)
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
I am gathering information about resources available for Atlassian product knowledge transferring for a presentation in our local Atlassian User Group. I want to group them in four categories From ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs