Possible to anchor QML items to animating keyboard (inputMethod)

Request is to possibility to anchor QML item to animated inputmethod keyboard. Idea is that (in iOS) system background wouldn't slide up and selected items in are can be handled to slide with the keyboard animation.

Implementation should be simple something like:

Item {
  y: Qt.inputMethod.keyboardRectangle.y - height - margin
  ..
}

Currently there lots of work to get it work. Need to implement separated animation and use some magic numbers. Keyboard height is not know at first visible time. etc.