如何使用信号将python字典发送到QML接口？

from PyQt5.QtCore import QObject, pyqtSignal
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine

class Signal(QObject):
    dataChanged = pyqtSignal(dict)

data = {'key1': 'value1', 'key2': 'value2'}

sender = Signal()
sender.dataChanged.connect(engine.rootObjects()[0].setData)

sender.dataChanged.emit(data)

import QtQuick 2.0

Item {
    id: root

    function setData(data) {
        // 在此处处理接收到的字典数据
        console.log(data.key1)  // 打印字典中的 'key1' 值
    }

    // 其他 QML 组件和界面定义
}