HarmonyOS 使用bindSheet打开底部弹窗后如何设置左上和右上的圆角

如下代码所示，使用bindSheet打开底部弹窗后如何设置左上和右上的圆角？

@Preview
@Component
export struct GeneralBottomComponent {
  @State isShowSelectSpecificationDialog: boolean = false
  build() {
    Column() {
      Divider().width('100%').height(0.5).color('#eeeeee')
      Row() {
        ConsultComponent()
        CollectComponent()
        ShoppingCarComponent()
        AddToShoppingCarComponent()
        BuyRightNowComponent().onClick(() => {
          console.log("GeneralBottomComponent onClick ")
          this.isShowSelectSpecificationDialog = true
        })
          .bindSheet($$this.isShowSelectSpecificationDialog, buildSelectSpecificationComponent(), {
            height: SheetSize.FIT_CONTENT,
            preferType: SheetType.BOTTOM,
            backgroundColor: Color.White,
            maskColor: '#99000000',
            showClose: false,
          })
      }.width('100%').height(54)
    }.width('100%')
  }
}