如何实现一段长文本中间带倒计时效果的？

textTimerController: TextTimerController = new TextTimerController()  
@State format: string = 'mm:ss'  
  
build() {  
  Column() {  
    Row() {  
      Text('呼气倒计时进行中, 请在').fontSize(20)  
      TextTimer({ isCountDown: true, count: 900000, controller: this.textTimerController })  
        .format(this.format)  
        .fontColor(Color.Red)  
        .fontSize(20)  
      Text('后前往呼气室')  
    }  
  }  
}