I don't see how they could make it work?
Plex achieves this with a very convoluted setup [1] - they set up a DNS server so that 1-2-3-4.625d406a00ac415b978ddb368c0d1289.plex.direct returns IP address 1.2.3.4, then they issue a single user a wildcard certificate for *.625d406a00ac415b978ddb368c0d1289.plex.directOf course, you have to get a special deal from a CA at who-knows-what-cost - likely meaning open source projects need not apply. And you get a dependency on cloud infrastructure, if they stop issuing certs you end up in a bad place. And you get a giant, ugly URL. And you have to make a DNS lookup so traffic leaves your network anyway.
It's an ugly solution with a lot of downsides - but I doubt the CA/Browser Forum plans to give people much choice in the matter, so it's their way or the highway :-|
[1] https://blog.filippo.io/how-plex-is-doing-https-for-all-its-...