The task is not trivial though possible.
The CS-Script engine is just an assembly so you only need to find the way of executing certain entry point of this assembly.
I have attached the source of the helper class I coded long time ago to execute managed assembly from unmanaged host app. You will need to rework it as the COM primary method has been deprecated. But it will give you an idea.
Of course if you pass data in and out you will amslo need to solve arguments serialization problem but it is all doable.