How to change root for subproject?

I have directory tree like this:

+ Some root folder
|---+ Main project folder
|---|---+ Includes folder
|---|---+ Sources folder
|---|---+ CLionIDE folder
|---|---|---- CMakeLists.txt
|---+ Extra project folder
|---|---+ Includes folder
|---|---+ Sources folder
|---|---+ CLionIDE folder
|---|---|---- CMakeLists.txt

So, I can change root for Main project with Tools-Cmake-Change project root. (I can't change location cause some specific projects structure in company)

And also I can add Extra project to Main project with

add_subdirectory(../../Extra/CLionIDE ...)

in CMakeLists.txt for Main project.

But I don't know how to change root for Extra project, so I will see very strange structure in Project panel. All Extra project files move to root directory (only in Project panel of course).

So, can I change root for Extra project or not?