Grouping by Post, Content Type and Custom Groups

I would like to add a site-wide search to my BuddyBoss (buddypress + bbpress + extra features) website. I have configured a search instance that returns the appropriate results, however I cannot get the Grouping to work as desired via the menus.

I can either select to group by post type or content type, but the search encompasses both – posts such as posts, pages, forum topics etc… – and content type such as BuddyPress activities.

Is there a way to combine these grouping types or even add my own groups via code? BuddyBoss has various specific activity types such as Documents, Photos, Videos, and they can also be posted in a personal activity feed or a group’s activity feed.

An alternative is that BuddyBoss’ search functionality has its own template system that generates groupings with tabs. Would it be more feasible or appropriate to try to pass the results from ASP to that?

Thank you.