ContextMenu on a Dialog doesn't open

import QtQuick
import QtQuick.Controls.Basic

ApplicationWindow {
    id: window
    width: 600
    height: 400
    visible: true

    TapHandler {
        onTapped: dialog.open()
    }

    Dialog {
        id: dialog
        width: 200
        height: 200

        contentItem.ContextMenu.menu: Menu {
            Action {
                text: "Test"
            }
        }

        // Also doesn't work
        // Rectangle {
        //     color: "tomato"
        //     anchors.fill: parent

        //     ContextMenu.menu: Menu {
        //         Action {
        //             text: "Test"
        //         }
        //     }
        // }
    }
}