Most relays are roughly the same…
Most relays are roughly the same and so their description makes no sense.
OTOH custom relays/feeds do differ and have a proper description and admin, those could be used to populate a nice table of relay+author+desc+url+icon(if we extend the relay info NIP to include 'icon' field).
Labels for relays are heavily discussed in NIP-32 as 'relay reviews', just FYI