Change NPM Listen port based on Proxy Host

Hi, I have two proxy hosts in my NPM docker container:
I.) Public Website and therefore Port 80 and 443 should be used for NPM to listen on and forward to port 80 of the target HTTP Joomla app. I want that this app is accessible with port 80 and 443
II.) Private self build web app that only I will access. I want that this second proxy host is ONLY accessible via Port 8443

In my docker compose file I created a Host:Container Mapping for all three ports:

    ports:
      # These ports are in format <host-port>:<container-port>
      - '80:80' # Public HTTP Port
      - '443:443' # Public HTTPS Port
      - '8443:8443' # Private HTTPS Port
      - '81:81' # Admin Web Port

What I can do so far is add listen 8443 ssl http2; to the Advanced Tab in the target proxy host number II

That opens up Port 8443 for the proxy host number I and II.
and Port 443 is still open for proxy host number I and II.

Is there a way to change the default 443/80 listen ports of NPM ONLY for proxy host number II ?

Start with the proxy host's Advanced Tab configuration and the docker-compose port mappings described in the issue. Trace how NPM turns per-host listen directives into nginx configuration; done means one proxy host can use 80/443 while another is reachable only on 8443 without changing the other host's listeners.