there's the need of also:
client_assertion and client_assertion_type
The authentication token MUST be sent as the value of the [OAuth.Assertions] client_assertion parameter.
The value of the [OAuth.Assertions] client_assertion_type parameter MUST be "urn:ietf:params:oauth:client-assertion-type:jwt-bearer", per [OAuth.JWT].
standing at: https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication
there's the need of also: client_assertion and client_assertion_type
Do we need to have this behaviour as default in: https://github.com/openid/JWTConnect-Python-OidcService/blob/d06bf271d6de51682c6a8a34a202c612855ec56f/src/oidcservice/client_auth.py#L382