ListElement: Make enum assignments compilable by qmlsc

import QtQuick
import QtQuick.Controls.Basic

Window {
    width: 640
    height: 480
    visible: true

    enum MyEnum {
        Alpha,
        Bravo,
        Charlie
    }

    ComboBox {
        textRole: "key"
        valueRole: "value"
        model: ListModel {
            ListElement { key: "A"; value: Main.MyEnum.Alpha }
            ListElement { key: "B"; value: Main.MyEnum.Bravo }
            ListElement { key: "C"; value: Main.MyEnum.Charlie }
        }
        onActivated: console.log(currentIndex, currentText, currentValue)
    }
}