HarmonyOS TextPicker怎么支持深度为3的树的显示？

class bottom {  
  bottom:number = 50  
}  
let bott:bottom = new bottom()  
@Entry  
@Component  
struct TextPickerExample {  
  private cascade: TextCascadePickerRangeContent[] = [{  
    "text": "别墅",  
    "children": [  
      {"text": "刘胜亮的别墅"},  
      {"text": "张月栋的别墅", "children": []}  
    ]  
  }]  
  
  build() {  
    Column() {  
      TextPicker({ range: this.cascade }).canLoop(false)  
        .onChange((value: string | string[], index: number | number[]) => {  
          console.info('TextPicker 多列联动:onChange ' + JSON.stringify(value) + ', ' + 'index: ' + JSON.stringify(index))  
        })  
    }  
  }  
}