Creating a loop to display all users of my community (for example authors)

Hi,
I’m trying to create a page that lists all users of my community in a similar way as what was done for the dentist preset template.

I do not manage to use the flex loop filter to display the list of users.

Ideally, I would like to extend the user custom post so that they be tagged with skills and other criterias (just like for doctors/dentists, somehow..)

Is there an easy way to get this done ?

Thank you very much

Emma