Delphi Rest Client: TDsRestConnection as TRestClient

I want write a client application that consumes Rest webservice from a server, but I want to use the reflections components from Firedac. The problem is ... those components connect to a TDsRestConnection component, and I haven´t a server Rest, only a webservice. How can I do for "cast" a TdsRestConnection as TRestClient or how I can access with Firedac reflections to objects ? Is it possible?