Sign a JWT with RSA SHA256 in APIM Policy Expression
Provide access to RSACryptoServiceProvider or System.IdentityModel.Tokens.Jwt so that its possible to construct and sign a JWT from a policy expression within Azure API Management.
Right now there's no libraries to help with signing JWTs within a policy in APIM. In scenarios where APIM needs to invoke backend APIs which dictate a security protocol which requires signed JWTs (ex. https://tools.ietf.org/html/rfc7523 on Salesforce) you need a backend API between APIM and your platform just to do the token exchange.