Setting up Faktory via private service but expose web UI

contribsys/faktory-render: How to deploy Faktory to Render.com (github.com)

Is it possible to expose one port publically and one port privately?

Render will only expose HTTP ports to the public.
You can deploy Faktory as Web Service instead of Private Service.
In this case, you will be able to access the Faktory dashboard by the public onrender URL. (remember to set FAKTORY_PASSWORD environment variable)