Add CMakeLists.txt that only uses add_subdirectory() to Visual Studio solution

Usage
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1

We have the following structure

/libs/CMakeLists.txt
/libs/lib1/CMakeLists.txt
/libs/lib1/src/...
/libs/lib2/CMakeLists.txt
/libs/lib2/src/...

In /libs/CMakeLists.txt we only include other CMakeLists.txt files:

add_subdirectory(lib1)
add_subdirectory(lib2)

I’d like to have /libs/CMakeLists.txt in the Visual Studio solution. By default, there is no project that this file is added to by CMake. That means that if I do a global search for “lib1”, I won’t find the “add_subdirectory(lib1)” line.

I’ve tried adding a dummy add_library(libs_helper INTERFACE CMakeLists.txt). Other recommendations?