Routing multiple domains/hostnames to a sprite

I am interested in setting up a Sprite for this app I am building. But the app has 2 different hostnames it listens to traffic on. The apps routing is configured for a main domain for the customer facing portion of the app, and a second subdomain for the admin panel routes.

If I understand correctly a sprite gets a single URL like: (name).sprites.app. Is there any way for pointing multiple domains at a sprite? Or if this a feature that would need to be added, like maybe like routing *.(name).sprites.app to the sprite so I could use the base domain for the main app then choose an arbitrary subdomain like admin.(name).sprites.app that will also route to my sprite that I can map to the admin routes?

I believe there are plans for custom domains, but probably not wildcard subdomains on the sprites domain itself. At the moment the best way to do this is probably creating a normal Fly app to proxy requests to custom wildcard domains to your sprite instead.