Yes that would be great, visible to people and easy to direct them to the supported marketplaces by helping listing the respective relays in the clients.

I also hope to see a comprehensive list of relays of what they advertise as spam filters. It took a random post of a relay owner for me to get their policies based either on repetitive messages, npubs or IPs. It is up to the relays to do so and naturally people would like to know how's that being handled so if there is a way to include that in the relay info, it's def a point of interest.