[Interest] making 'hole' in the rectangle

[Alexander Ivash]

Is it possible to implement a 'hole' component which would make color of
its parent control transparent? For example:

Rectangle {
    width: 100
    height: 100

    color: 'blue'

    Rectangle {
        width: 50
        height: 50

        color: 'green'

        Hole {
           anchors.fill: parent
            width: 25
            height: 50
        }
    }
}

Expected result: area 100x100, filled with blue and 25x50 (not 50x50 as we
erased half of area with 'Hole') area of green on top.
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