Unfortunately it is not.
My only issue with filepizza is, I wanted to host one internally, but it has a hard dependency on a hardcoded list of torrent trackers. (I have a DENY ALL firewall rule at the border which can't be touched) :(
I really prefer p2p if available, and on my LAN it doesn't have to traverse NAT or anything.
Or just start poking through their code and WebRTC docs/libs to see what you can build yourself.
We do NAT traversal but also connect to local peers over multicast DNS. Command line client should have a local or offline option to restrict only to local peers soon.