There's a NIP proposal for this. I think it's a pet names NIP? I'd like it too. nostr:nprofile1qqszrdqezqk63lqt4yzgftkfxjl4tdatea67akeezf8g6a0yj86p5hsppemhxue69uhkummn9ekx7mp0qyg8wumn8ghj7mn0wd68ytnddakj7qg3waehxw309ahx7um5wgh8w6twv5hs7hzcmq what's the NIP for this?