Find position of delegate in QML

I have an QML GridView that is displaying items from a model. A separate overlay needs to know the screen positions of the items within that GridView. However, I am having trouble accessing the positions.

As a minimal example, I tried:

GridLayout {
    columns: 2

    Repeater {
        model: inputs

        Text { text: title }

        onItemAdded: function (idx, item) {
            let pos = item.mapToGlobal(item.x, item.y);
            console.log("Position:", pos, "X: ", item.x, "Y: ", item.y);
        }
    }
}

However, while this puts all five items on the screen, onItemAdded reports the exact same position for each item.

qml: Position: QPointF(458, 262) X:  0 Y:  0
qml: Position: QPointF(458, 262) X:  0 Y:  0
qml: Position: QPointF(458, 262) X:  0 Y:  0
qml: Position: QPointF(458, 262) X:  0 Y:  0
qml: Position: QPointF(458, 262) X:  0 Y:  0

How do I get the individual positions of each item?

You probably call it a little early. The layout is still incomplete.
You maybe can change it to something like this:

    GridLayout {
        columns: 2
        anchors.fill: parent

        Repeater {
            id: repeater
            model: ["apples", "oranges", "pears", "bananas"]

            Text { text: modelData }

            Component.onCompleted: {
                for(var i = 0;i < repeater.count;i ++)
                {
                    let item = repeater.itemAt(i);
                    let pos = item.mapToGlobal(item.x, item.y);
                    console.log("Position:", pos, "X: ", item.x, "Y: ", item.y);
                }
            }
        }
    }