HarmonyOS 鸿蒙Next Select 组件为什么不能自定义右侧的Row箭头

目前不支持设置侧的箭头，这是当前的规格，可以给select添加浮层实现

// xxx.ets
import image from '@ohos.multimedia.image'

@Entry
@Component
struct SelectExample {
  @State text: string = "请选择"
  @State index: number = 2
  @State space: number = 8
  @State arrowPosition: ArrowPosition = ArrowPosition.END

  @Builder
  OverlayNode() {
    Column() {
      Image($r('app.media.background'))
    }.width(20).height(20).alignItems(HorizontalAlign.Center)
  }

  build() {
    Column() {
      Select([
        { value: 'aaa', },
        { value: 'bbb', },
        { value: 'ccc', },
        { value: 'ddd', }])
        .selected(this.index)
        .value(this.text)
        .font({ size: 16, weight: 500 })
        .fontColor('#182431')
        .selectedOptionFont({ size: 16, weight: 400 })
        .optionFont({ size: 16, weight: 400 })
        .space(this.space)
        .arrowPosition(this.arrowPosition)
        .menuAlign(MenuAlignType.START, { dx: 0, dy: 0 })
        .optionWidth(200)
        .optionHeight(300)
        .overlay(this.OverlayNode(), {
          align: Alignment.Bottom,
          offset: { x: -30, y: -10 }
        })
        .arrowPosition(ArrowPosition.START)
        .onSelect((index: number, text?: string | undefined) => {
          console.info('Select:' + index)
          this.index = index;
          if (text) {
            this.text = text;
          }
        })
    }.width('100%')
  }
}