Adding Custom values in Identity Server 4 Connect/token endpoint

Question

i have implemented the Identity server 4.. one thing on which i am stuck is currently connect/token endpoint provides the following fields

{ "id_token": "id toekn value", "access_token": "access token value", "token_type": "Bearer", "refresh_token": "a refresh token", "scope": "some scopes" }

however i want to add some more fields in this like

{ "id_token": "id toekn value", "access_token": "access token value", "token_type": "Bearer", "refresh_token": "a refresh token", "scope": "some scopes", "id":"any id", "url":"any url" }

any way to intercept this call and add custom fileds???