[Feature Request] Sharing Pages between Spaces

Forgive me if I've overlooked a previous matching request, but I couldn't find one.

The ability to share notes between spaces would be a nice feature to have. I have a vision where a department manager or team lead keeps private notes about team/department members, such as reviews and performance evaluations, then they can choose to share out those notes with just the specific member.

Having an automatic Private Space per-user would probably also need to be a requirement here.