How to set uid for voume mount dir

Mounting a Ceph Block devices as a fs mount in a job - works fine.

However, trying to run MS SQl Server on it and that always runs as an unprivileged user, “mssql”, uid = 10001 and they don’t have rights to the path.

Normal way to handle that is to set the owner of the path to uid 10001, but I can’t find any way to do that in Nomad or the CSI Plugin.

I have tried setting the task user to “mssql” or “10001” but that doesn’t help.