How do I send to specific external authorizer endpoint by path along with other particular HTTP configuration?

As mentioned above, for configuring an external authorizer through AuthorizationPolicy’s custom action.
I want to send my request to a EA, but the current implementation seems to directly through request to whateven it defines to EA, without mutating any path, http method etc.,
How do I configure AuthorizationPolicy to make all the request to a specific EA endpoint? for instance

POST /authorization

cc @YangminZhu on external authorization.