What you mean by tag a team? You can mention an user to a page, and we do have a feature request already open so you have the ability to extend mention to groups as you can see here:
At this moment, we can't mention groups.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
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