HarmonyOS 鸿蒙Next RichEditor自定义解析video和添加video标签吗

@Builder
function placeholderBuilder2() {
}
// xxx.ets
@Entry
@Component
struct Index {
  controller: RichEditorController = new RichEditorController();
  option: RichEditorOptions = { controller: this.controller };
  private start: number = 2;
  private end: number = 4;
  @State message: string = "[-1, -1]"
  @State content: string = ""
  private my_offset: number | undefined = undefined
  private my_builder: CustomBuilder = undefined
  @Builder
  placeholderBuilder() {
    Row({ space: 2 }) {
      Video({
        src: $rawfile('video(1).mp4'),
        previewUri:$r('app.media.app_icon'),
        currentProgressRate: PlaybackSpeed.Speed_Forward_1_00_X,
        controller: new VideoController()
      })
    }.width('20%').height(50).padding(10).backgroundColor(Color.Red)
  }
  build() {
    Column() {
      Column() {
        RichEditor(this.option)
        Button("add span")
          .onClick(() => {
            let num = this.controller.addBuilderSpan(this.my_builder, { offset: this.my_offset })
            console.info('addBuilderSpan return ' + num)
          })
        Row() {
          Button('builder1').onClick(() => {
            this.my_builder = () => {
              this.placeholderBuilder()
            }
          })
        }
      }
      .borderWidth(1)
      .borderColor(Color.Red)
      .width("100%")
      .height("70%")
    }
  }
}