HarmonyOS 组件绑定popup弹窗，如何将弹窗背景设置成透明状态

参考代码：

@Entry
@Component
struct PopupExample {
  @State handlePopup: boolean = false
  @Builder popupBuilder(){
    Text('气泡的内容')
  }

  build() {
    Column() {
      Button('PopupOptions')
        .onClick(() => {
          this.handlePopup = !this.handlePopup
        })
        .bindPopup(this.handlePopup, {
          builder: this.popupBuilder(),//内容
          placement:Placement.Bottom, // 气泡的弹出位置
          maskColor: Color.Transparent,
          popupColor:Color.Transparent, // 气泡的背景色
          backgroundBlurStyle: BlurStyle.NONE,
          shadow: {
            radius:0
          },
          onStateChange: (e) => {
            console.info(JSON.stringify(e.isVisible))
            if (!e.isVisible) {
              this.handlePopup = false
            }
          }
        })
    }
    .justifyContent(FlexAlign.Center)
    .height('100%')
    .width('100%')
    .padding({ top: 5 })
    .backgroundColor(Color.Pink)
  }
}