Share and co-edit a vault?

Is it possible to create an Obsidian vault that can be shared with a small group and edited via an online interface? I am thinking of something like overleaf which allows you to share and co-edit latex documents.

Other threads on this forum mentioned Obsidian Sync, which I haven’t tried yet, which seems more like a cloud backup / synchronizing across devices for one user.

It is possible and officially supported to share a vault via Obsidian Sync. Editing the same at the same time (realtime collaboration) does not work (yet)