Is it possible to run a few services under one domain in fly.io?

I have a service that uses reactjs as web app and go backend service. I run it now in kubernetes in GCP using Ingress to route traffic between services. If the path is mydomain.com/back — it is routed to backend, if it’s mydomain.com/anything-other — routes to web app.
Is it possible to build such construction on fly.io?
Would appreciate your ideas a lot. Thanks.

apologies if you’ve already seen this and/or it’s clearly a good fit for you, but you can definitely use the fly-replay headers http traffic to send requests to different apps, regions, and vms. Here’s the docs:

there’s also a lot of great discussion to be found here in the forums on this topic!