I noticed that ES256K is becoming increasingly popular. People are using jwt.io debugger to verify existing JWT tokens. Adding the ES256K would be great so others can verify also SECP256K1 tokens.
The best way to provide such product feedback would be through our product feedback form. Once you provide it make sure to share as much context as possible so the team have proper justification for implementing it in the future. You should be contacted by one of our product managers within 10 business days regarding that. Thank you!