Multidomain session/authentication support

Is there any way or plans to support multidomain session and/or authentication scenario? I'm trying to migrate existing ASP.NET SaaS multiple subdomain app (subdomain1.example.com, subdomain2.example.com etc), provided multiple Routes/Clusters in ReverseProxy configuration and it works greats. The next step would be setting RemoteAppUrl in AddRemoteAppClient options, but in this case it must be different for each subdomain.

I've checked both RemoteAppClientOptions and RemoteAppAuthenticationService, but don't know how to do that (easily) without overriding huge part o code.