Merger

main.qml

    ListMerger {
        target: window
        property: "values"

        values: [
            "I am a child",
        ]
    }

    ListMerger {
        target: window
        property: "values"

        values: [
            "I am a grandchild",
        ]
    }

    Column {
        anchors.centerIn: parent
        spacing: 6

        Repeater {
            model: values

            Label { text: modelData }
        }
    }