You can’t assign ports via DNS, what you need is a reverse proxy. Nginx proxy manager is easy to use and very popular.

Or “if you’re having trouble there is no manual, FAQ, or wiki, just join our discord troubleshooting channel” vomit

The best is when people tell you to RTFM and the information you need just straight up isn’t there.

Check out sunshine/moonlight. It takes some tinkering but it runs better than remote play and can be configured to auto change your resolution on connect and disconnect. There’s also a plug-in for decky as well.