Sub-project created with qt_add_qml_module doesn't work on Android

I tried build application as described at one of new posts in blog about qt_add_qml_module with CMake. It works on desktop linux but it fails on Android with error:

W libqt_add_qml_module_test_arm64-v8a.so: qrc:/Test/main.qml:11:3: ExtraButton is not a type

Also I found out that without that 2 modifications QtCreator doesn't see plugins declared by qt_add_qml_module:

// CMakeList.txt from executable
set(QML_IMPORT_PATH ${CMAKE_BINARY_DIR} CACHE STRING "" FORCE)

// CMakeList.txt from sub-project I had to add DESIGNER_SUPPORTED option which was not described as required
qt_add_qml_module(test_extra
    URI "TestExtra"
    VERSION 1.0
    QML_FILES
        ExtraSingleton.qml
        ExtraButton.qml
    DESIGNER_SUPPORTED
)

I attach minimal working project