we should be able to get that with NIP-66 and the stuff  nostr:npub1uac67zc9er54ln0kl6e4qp2y6ta3enfcg7ywnayshvlw9r5w6ehsqq99rx built:

nak req -k 30166 -t N=50 relay.nostr.watch -a 9bbbb845e5b6c831c29789900769843ab43bb5047abe697870cb50b6fc9bf923 should get it, but I see it's returning non-NIP-50 relays 🤔

kind:30166 with "#N": ["50"] should get that info 😀