um_members_directory_display hook

I’m creating a Member Directory custom template which will show all of the User’s data for all Users in one table (there’s not much data in total).
I was planning to use the um_members_directory_display hook, but it seems like that was never implemented?
If I use the Default Member Directory template as a guide, then I will need to make an ajax call for the directory, then an additional ajax call for each and every user. Is there no way to avoid that? I would prefer to get all the data (or, at least the paginated data) with one ajax call.

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