With TrueNas you can do it two ways: ISCSI disks that are mounted to the VMs or via NFS. With ISCSI you won’t have access to the data from the TrueNas side as the data will be stored as a volume file. With NFS you get the best of both worlds as you’ll be able to access the files via other TrueNas services like SMB/SFTP. I have my Jellyfin/Plex running via NFS and have few issues, though I’ve not tested it with large 4k/8k videos yet. I mostly run 1080p.