There is no support for claims query parameter and the well-known endpoint doesn't provide claims_supported.
In OIDC discovery http://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata is specified this :
So it's not REQUIRED per specs, however there is still 1 failing test from conformance testsuite because of this. Details in attachement.
We can possibly also add some other claim related stuff to WellKnown endpoint (support for "claim_types_supported" should be easy as we support just "normal" . Support for "claims_parameter_supported" might be more tricky (in case we want to use "true" ), however it seems that we will need to support "claims" parameter to support some other tests from OIDC conformance testsuite without FAILURE or WARNING.