I am trying to access a MVC web app built with .NETCore framework on Visual Studio for Mac over the local wifi.
For Windows, the related question is:
Connecting to Visual Studio debugging IIS Express server over the lan
Edit: This is for the Debug mode of Visual Studio
This is not possible in the current implementation of VS.
However, VS comes with live share feature. This way the host machine can share the port with the live-shared machine(s) and it can be debugged on any machine.