Since in some services there's append_to_response that is not documented, i tried that on the Account endpoint, whatever you will place in the append_to_response, will append that field on the response with the same object of your account, so you will basically get 2 objects of your account, in the same response. if you define n append_to_response paths, you will get n+1 objects of your profile, (considering the +1 the primary object)

No matter what you write on the request, you will get a field called this way, with the object of you account.