BuddyPress.org

You’d have to create a plugin that adds group meta information.

If you’re familiar with a little PHP, check out this post for a brief primer:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/adding-more-fields-to-groups/#post-64306

Also check out the Group Extension API:
https://codex.buddypress.org/developer-docs/group-extension-api/