SSL with Docker (HA, Node-RED, Unify)

Hey folks! A question…

I have a pretty straightforward setup in Docker. Here’s a screenshot from Portainer:

I’m struggling to wrap my head around making it possible to SSL via DuckDNS to all of these services. I’m assuming I could add a Let’s Encrypt container and I know how to do all the certificate and key stuff on the HA side, but I’m also assuming that doesn’t automatically allow me to have a secure connection to the other services I’m running, right?

Would appreciate any insight anyone can offer! TYIA!

Nginx, caddy, or traefik should handle the certain and the proxy.