When I expose a service on one site I specify the port that the service is exposed on:

skupper expose host host.containers.internal --address database --port 5432

When I create that service on another site, I have to add that port again:

skupper service create database 5432

I want to be able to do this in case I need a non-standard port, but it would be nice if this metadata was available as a default if I didn't know the port