HarmonyOS Text的Span如何添加背景为边框？

@Entry  
@Component  
struct Example {  
  build() {  
    Stack({ alignContent: Alignment.TopStart }) {  
      Text('123')  
      .fontSize(20)  
        .textIndent(20 + 150)  
        .width(300)  
      Text('999')  
      .fontSize(20)  
        .width(150)  
        .margin({ left: 10 })  
        .padding({ left: 10 })  
        .border({ width: 1, color: Color.Red, radius: 10})  
    }  
  }  
}