NIP 32. Permission is based on reader rather than writer though.
Are collaborative lists that permissioned users can add to a thing? nostr:npub1zuuajd7u3sx8xu92yav9jwxpr839cs0kc3q6t56vd5u9q033xmhsk6c2uc
Discussion
Would love a private list with write permission for Nostr Report contributors. We basically do this right now with a Telegram bot, but would be cool to make this Nostr native.
You could do this with my proposed NIP 86 key sharing depending on your requirements: https://github.com/nostr-protocol/nips/pull/875