Did something came out of this?
I was looking into using PvE as my btrfs storage manager, and mount the files directly into several LXC to be able to use it there and was hoping to use lxc OMV to share the content over smb and nfs...
I do have OMV running on a debian11 LXC but not able to use /mnt/brtfsnvme as a shared folder it seems it always needs a filesystem...