I very highly recommend that you take the time and just switch. Caddy is simply fabulous. It's designed to work (assuming it's compiled with the module) with containers and use docker networks for routing. It makes it easy to spin up containers and directly reference the container names instead of remembering IP addresses and particularly comes in handy when your entire environment is containerized.
You can pull the caddy image and run it in docker and as long as your environment is configured correctly you can simply reverse_proxy @container
and you're done. Caddy pulls all the relevant port information directly from the container API.
I get such a nerd boner thinking about it.
I really love home labs but this sounds incredibly over engineered for its purpose... I would expect a set up like this for an enterprise environment...