如何将图像放置到Kivy上的特定布局中

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image

class MyBoxLayout(BoxLayout):
    pass

<MyBoxLayout>:
    orientation: "vertical"
    Image:
        source: "path_to_image.png"
        size_hint: (1, 1)  # 图像尺寸占布局的比例
        allow_stretch: True  # 允许图像自动拉伸以适应布局

class MyApp(App):
    def build(self):
        return MyBoxLayout()

if __name__ == "__main__":
    MyApp().run()