Adding a JSON Web Key to a schema Person?

I've been thinking recently about the idea of a social network based on
schema.org

What would be useful would be to add a public key to the JSON for a schema
Person

https://tools.ietf.org/html/rfc7517

Example key:

     {"kty":"EC",
      "crv":"P-256",
      "x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",
      "y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0",
      "kid":"Public key used in JWS spec Appendix A.3 example"
     }

I was wondering if there already exists a practical way to do this?