ListElement: cannot use script for property value

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    enum TextType {
        Normal,
        Heading
    }

    ListView {
        anchors.fill: parent
        width: 180; height: 200
        model: ListModel {
            ListElement {
                name: main.TextType.Normal
            }
            ListElement {
                name: main.TextType.Heading
            }
        }

        delegate: Text { text: name }
    }
}