如何让Select下拉组件动态显示选中的值

@Entry
@Component
struct Index {
  @State currentIndex: number = 1
  @State text: string = '请选择'

  build() {
    Column() {
      Select([{ value: "aaaa", icon: $r("app.media.app_icon") },
        { value: "bbbb", icon: $r("app.media.app_icon") }
        , { value: "cccc", icon: $r("app.media.app_icon") }])
        .selected(this.currentIndex)//选中的选项的坐标
        .value(this.text)
        .onSelect((index: number, text?: string | undefined) => {
          text && (this.text = text)
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}