Make C++ returned QFuture usable with QML

We already have multiple parts where we can listen to c++ returned future

https://doc.qt.io/QtIVI/qml-qtivi-pendingreply.html

https://doc.qt.io/qt-5/qml-qtremoteobjects-qtremoteobjects.html#watch-method

even https://github.com/benlau/quickfuture

and many new additions in 6.2 and 6.3 but no way to use them in QML in a general way. I catch myself needing this sort of feature more and more. I do not want to create a new signal in c++ for everything, when a simple QFuture would solve all my problems...