QTVK basic example. Desktop vs Embedded

Circuits

Alright I need to go back to the basics here because apparently I still don't understand how this works. In basic (virtual keyboard example) the pro file has these lines:

disable-desktop|android-embedded|!isEmpty(CROSS_COMPILE)|qnx {
    DEFINES += MAIN_QML=\\\"basic-b2qt.qml\\\"
} else {
    DEFINES += MAIN_QML=\\\"Basic.qml\\\"
}

from what I understand these lines will detect what platform you are on and based on that will decide if the keyboard should be opening in a dedicated top-level window or embedded within the application, correct?

So I figured that if I want the keyboard to be embedded within the application then I should simply be able to alter the .pro file like so:

TEMPLATE = app
TARGET = basic
QT += qml quick
SOURCES += main.cpp
CONFIG += link_pkgconfig
static {
    QT += svg
    QTPLUGIN += qtvirtualkeyboardplugin
}

target.path = $$[QT_INSTALL_EXAMPLES]/virtualkeyboard/basic
INSTALLS += target

RESOURCES += \
    demo.qrc

OTHER_FILES += \
    Basic.qml \
    basic-b2qt.qml \
    content/AutoScroller.qml \
    content/HandwritingModeButton.qml \
    content/TextArea.qml \
    content/TextField.qml \

#zdisable-xcb {
#    message("The disable-xcb option has been deprecated. Please use disable-desktop instead.")
#    CONFIG += disable-desktop
#}

CONFIG += disable-desktop

disable-desktop|android-embedded|!isEmpty(CROSS_COMPILE)|qnx {
    DEFINES += MAIN_QML=\\\"basic-b2qt.qml\\\"
} else {
    DEFINES += MAIN_QML=\\\"Basic.qml\\\"
}

however this doesn't work. So perhaps someone can tell me how I need to alter this .pro file so that the keyboard shows up embedded in the application itself and not as a dedicated top-level window?