オブジェクトのプロパティとしてシングルトンにアクセスできない

import QtQml
import QtQuick as QQ

QtObject {
    id: root
    // Cannot access singleton as a property of an object. Did you want to access an attached object?
    property var singletonAccess: root.QQ.Application.platform
}

import QtQml
import QtQuick as QQ

QtObject {
    id: root
    property var singletonAccess: QQ.Application.platform
    property bool attachedPropertyAccess: root.QQ.ListView.isCurrentItem
}