qt6_add_qml_module How to configure include directory with CMake

[Tadinu]

Hi, I'm trying to expose my cpp-based class as a qml item with qml cmake api.
Afaik, qt6_add_qml_module is introduced to CMake in Qt6 so we don't have to use qmlRegisterType, as noted in this link and this SO answer also.

• I just have an issue with configuring include directories by target_include_directories, which works well as usual before me adding qt6_add_qml_module.
• The example shown in the link above is quite simple in the way that both extrathing.h/.cpp stay under the same folder, but typically our sources are put into different hierarchical folders.
  -> In that case, cpp files specified under SOURCES could not recognize include paths configured by target_include_directories anymore.

Would there be some way to help solve this do you guys happen to know? I also checked qt-custom-cmake commands but it seems to have no specific one for the purpose.
I'd really appreciate if @SGaist or someone in the champion group could share about some idea.
Thank you!