I'm talking about the kind of team I can create by visiting the "People > Your Teams > + Start a Team" page.
If not, what is the point of adding my teammates to a team if I can't find issues related to peoples' team memberships?
This page implies you can do something like that.., however, I have not been able to get JQL to recognize teams as a construct to query against. So, as far as I know, this doesn't work as a way of reporting against work.
If you look at the items returned by this filter, you may find some interesting ones related to team features to vote for:
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