That’s a cool idea. The hard part is building the list with enough/the right data. Getting all of a user’s followers is notoriously difficult. The list aspect is trivial though.
nostr:npub1zuuajd7u3sx8xu92yav9jwxpr839cs0kc3q6t56vd5u9q033xmhsk6c2uc It would be way easier for Listr to implement this if there were an option to turn your followers into a list and keep that list updated.
Discussion
I think api.nostr.band can provide that data, but I'm not sure; I'll have to read the doc. I will also look into it.