I want to know how to add Favorites in BuddyPress Member

Hello
I already ask this question Alexander began to answer me but I think it is no connect now and i need the answer.
(https://premium.wpmudev.org/forums/topic/add-like-or-favoris-in-profil-members-buddypress)
I want to know how to add Favorites in BuddyPress Member Profile Profile.
like the Screen

And create a page that the user can view the list of Favorites Members.
A page like buddypress members Directory but it display only favorite Members.
thanks.