Adding an external WMS service using REST service with Geoserver

I'm trying to add an External WMS layer to geoserver with a PHP page, using the REST service of Geoserver. I've already read the tutorials for creating the geoserver features (http://docs.geoserver.org/stable/en/user/restconfig/rest-config-api.html), but i couldn't find the way to create a new store and layer with an external WMS service.

in other words: I have the URL of the external WMS service (=store), the layer i want to publish (=layer) and the epgs i want to use.

Is there a way to load all of these information in the geoserver schema?