Internal share of Collective pages

[Ornanovitch]

Is your feature request related to a problem? Please describe.
Today you are able to share a page by link (public share), but you can't share the same page with Nextcloud users/groups/teams.

Describe the solution you'd like
Extend the sharing module with internal shares (like Notes, Deck, Files...)

Describe alternatives you've considered
You can share an entire Collective, but then you can't filter precisely who can view/edit what inside it.