This’ll likely be advice you don’t want since you’re specifically asking about passing through to a vm: just plug it into a separate, non-virtualized ingest machine instead.
I’m assuming you want this for makemkv or some equivalent to backup movies for plex. I’ve spent more time than it was worth trying to pass through a blueray reader for that purpose into a vm on truenas & ended giving up because I couldn’t find any solution for truenas or any other hypervisor. Every reddit post and/or forum I read basically ended in failure.