RichEditor组件如何设置光标的起始位置位于左上角

// xxx.ets 
@Entry 
@Component 
struct RichEditorExample { 
  controller: RichEditorController = new RichEditorController(); 
 
  build() { 
    Column() { 
      RichEditor({ controller: this.controller }) 
        .align(Alignment.TopStart) // 设置光标的起始位置位于左上角 
        .height(200) 
        .borderWidth(1) 
        .borderColor(Color.Red) 
        .width('100%') 
    } 
  } 
}