Interesting. I've done a lot of manual work to set up a whole nginx layer to properly route stuff through one domain to various self-hosted services, with way to many hard lessons when I started this journey (from trying to do manual setup without docker, to moving onto repeatable setups via docker, etc.).

The setup appears very simple in Caddy - amazingly simple, honestly. I'm going to give it a good try.

Or certbot-plugin-nginx if you prefer a bit less magic.