[QT3D] QML/C++ mix

[guy incognito]

I got a C++ Qt3D-application which is similar to the basic shapes example. The problem is, that the only approach to add widgets to the Qt3D-window seems to be via QWidget::createWindowContainer (correct me if I'm wrong), for example, adding a button to Qt3DWindow:

Qt3DExtras::Qt3DWindow *view = new Qt3DExtras::Qt3DWindow();
QWidget *container = QWidget::createWindowContainer(view);
QWidget *widget = new QWidget;
QHBoxLayout *hLayout = new QHBoxLayout(widget);
hLayout->addWidget(container, 1)

QPushButton* button = new QPushButton;
button->setText("Hello World");
hLayout->addWidget(button)

The problem is that this approach causes problems with Android devices, so I would like to set up the 3DWindow and UI-Elements with QML but leave all the other stuff, like creating Entities, in C++. How would I do this?

Edit: This old topic describes what I want to do, but it is unanswered