Is it possible to add files to a CMake generated solution folder in Visual Studio?

This question is more or less a warmup of this question:

how to get cmake to add files to msvcs solution tree

It never got a valid answer so I want to repose it slightly different:

Is it possible to use the cmake solution folders that where introduced with cmake 2.8.3 to add files directly to the vs solution? I want to do the cmake equivalent of VS->Solution->Add->Existing Item. So my file will appear in a folder that belongs to the solution and not to a project.

I found examples how the solution folders can be used to group targets into folders with code like this:

set_property( GLOBAL PROPERTY USE_FOLDERS ON)
set_property(TARGET ${TARGET_NAME} PROPERTY FOLDER "Test") 

So can I add a file instead of a target to the folder?

Starting with the fairly new CMake version 4.0 it is now possible to add arbitrary files to the Solution in VS. This is done through the newly added VS_SOLUTION_ITEMS Property, see here: VS_SOLUTION_ITEMS

This is a directory property, so it has to be applied on the same directory as your initial project() call is made in.

Usage example:

set_directory_properties(PROPERTIES 
    VS_SOLUTION_ITEMS 
        ./conanfile.py 
        ./cmake/marcos.cmake
        # etc..
)