As long as you're using one of the dynamic backends that Traefik hooks into, such as Consul for example, you can do this pretty easily.

I do this exact thing with Traefik, Consul, and some various miscellaneous services that don't fall under the dynamically-discovered umbrella when they might run under k8s or nomad. I write a value to Consul with the desired Host: match, a backend server to route requests to, and Traefik will handle routing to any backend server it can reach without restarts or interrupting service.