Yeah I don't expose Jellyfin over the Internet, so it doesn't matter for me, and wouldn't work at all over WAN (unless VPN'd to home network).
Also, it's all reverse proxied, and there's nothing preventing having two Jellyfin hostnames, e.g., jf-local.mydomain.com and jf-public.mydomain.com.
I'm guessing it wouldn't work for a variety of reasons, but having cameras digitally sign the image+the metadata could be interesting.