I, too, would like to see this, but it'll be a lot of work. It's just not a top priority right now for me, unfortunately.

This is something I could prioritize if a business wanted to sponsor this; but right now the most pressing things are updating the docs, revamping our test suite, and I have a few action items for existing sponsors I need to prioritize too.

Anyway, no timeline -- but definitely something wanted!

PS. There is kind of Caddyfile support here: https://github.com/RussellLuo/caddy-ext/tree/master/layer4