BuddyPress.org

No plugin exists for this at the moment.

This has to be manually coded. If you’re a plugin developer, check out this codex article:
https://codex.buddypress.org/developer-docs/group-extension-api/

And also check out the groupmeta functions in /bp-groups.php.

There are a few threads about this on buddypress.org. I’d suggest doing a search on Google.

An example can be found here:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/profile-fields-for-groups#post-78706