Showing Average MMR for Teams

Has anyone worked out how to make this show up on the post game dash?

I know some people had it briefly when the game first came out - but it popped up again on my son’s account last night. On the post-game stats under “Teams” it showed the average MMR of the team.

Nothing on my side though.

Is it just a PC thing? (he’s on PC while I’m on XSX).