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Point IIS application path to Docker container port

I have a web application hosted in Docker .net core runtime 2.2 image.
The Web application is accessible on the Windows Server 2016 VM via localhost:5003.

The same VM has IIS running multiple sites, e.g. www.mysite.com.
This existing IIS site has certificates and security set up and is hosting and running the production site.

I need to bind www.mysite.com/dockertest to (on the same host) localhost:5003.

I’m used to go into IIS, basic settings, and point to a physical path. My question is how to I get IIS to point to its localhost 5003 so it is accessible from dockertest url mentioned? There is no physical path to a file structure anymore.