adding a TrueNAS VM share to unprivelidged LXC

hi, looking for some semi-newbie help

i have PVE 8.2.4 running with various LXCs and VMs. all running good.
one of the VMs is TrueNAS with HBA in passthru mode - again this is running fine.

however, how do i map one (or any) of the NFS shares to PVE so that my LXCs can use it? (LXCs are unprivelidged)
i already have an external synology NAS share mapped via FSTAB on the PVE and then mapped to LXC via the LXC conf file.
obviously this method wouldn't quite work as the FSTAB will already...

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