如何将属性从python公开到QMLin树视图

from PySide2.QtCore import QObject, Property, Signal

class TreeItem(QObject):
    def __init__(self, name, parent=None):
        super().__init__(parent)
        self._name = name
        self._children = []

    @Property(str, constant=True)
    def name(self):
        return self._name

    @Property(QObject, constant=True)
    def children(self):
        return self._children

    def addChild(self, child):
        self._children.append(child)

from PySide2.QtCore import QObject, Property

class TreeModel(QObject):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._rootItem = None

    @Property(QObject, constant=True)
    def rootItem(self):
        return self._rootItem

    def setRootItem(self, rootItem):
        self._rootItem = rootItem

import QtQuick 2.0
import TreeModel 1.0

TreeView {
    id: treeView
    model: TreeModel {
        rootItem: TreeItem {
            name: "Root"
            children: [
                TreeItem { name: "Child 1" },
                TreeItem { name: "Child 2" },
                TreeItem { name: "Child 3" }
            ]
        }
    }
}