Question How to make DLL for Visual Studio or QT project that uses UnityEngine.dll libraries?

Hi everyone,
I am trying to create a dll library that uses UnityEngine.dll library file. My target is to run this package to Simple Visual Studio Console project and Qt C++ project.
I don't have to display anything, I even don't need any scene. I only want to use some of UnityEngine.dll functions like Camera.ScreenToWorldPoint, Raycast, Linecast etc. I have to use these features to calculate some data and use the values.
I need help how to make package by using UnityEngine.dll that can be access in other projects as well.