RP has nothing to do with any programming language or framework, if a web server exists, you can put a reverse proxy in front of it.

In this case, asp.net core has a built-in web server named Kestrel. IIS can be used as a reverse proxy so you can have IIS forward requests to web servers bound to local host.

Personally, I think its quite hilarious that you went straight to k8's. The vast majority of asp.net code is running on servers (bare metal or otherwise).