QTreeWidget如何向子项添加复选框？

from PyQt5.QtWidgets import QApplication, QTreeWidget, QTreeWidgetItem, QMainWindow
from PyQt5.QtCore import Qt

if __name__ == '__main__':
    app = QApplication([])
    window = QMainWindow()
    
    tree_widget = QTreeWidget(window)
    tree_widget.setHeaderLabels(['Items'])
    
    # 创建父项
    parent_item = QTreeWidgetItem(tree_widget)
    parent_item.setText(0, 'Parent Item')
    
    # 创建子项
    child_item = QTreeWidgetItem(parent_item)
    child_item.setText(0, 'Child Item')
    
    # 设置子项的复选框状态
    child_item.setCheckState(0, Qt.Checked)
    
    tree_widget.addTopLevelItem(parent_item)
    tree_widget.expandAll()
    
    window.setCentralWidget(tree_widget)
    window.show()
    
    app.exec_()