CLion header search path for 'installed' headers

We have a pretty large codebase (10K+ files).

And for some historical reasons all directories are organised the following way:

<prjroot>/
    mylib1/
           MyLib1Class1.h
           MyLib1Class1.cpp
           MyLib1Class2.h
           MyLib1Class2.cpp
    mylib2/
           MyLib2Class1.h
           MyLib2Class1.cpp
           MyLib2Class2.h
           MyLib2Class2.cpp

The 'install' target is doing the following:

rule 1:
    install mylib1/*.h into install/LibMyLib1/   // note prefix Lib here
rule 2:
    install mylib2/*.h into install/LibMyLib2Ext/   // note prefix Lib and suffix Ext here

All C++ files will include headers the following way:

//some_file.cpp:
#include <LibMyLib1/MyLib1Class1.h> 
#include <ExtMyLib2/MyLib2Class1.h>

If I add  "include_directories( install )" into CMakeLists.txt then CLion can successfully parse all files.

But when I ctrl+click onto MyLib1Class1 -> it opens "install/LibMyLib1/MyLib1Class1.h".

This is inconvenient, cause I cannot edit that file.

What I want CLion to do is to open: project source file "<prjroot>/mylib1/MyLib1Class1.h".

Of course CLion works fine if I change "include" directive to "#include <mylib1/MyLib1Class1.h>. But apparently I cannot change all 10K files, also it would break existing Makefile-based build system.

Any suggestions?

Maybe some sort of 'hacking' into CLions VFS sub-system?