HarmonyOS Text如何实现根据变量字符改变text中对应字符指定颜色

参考示例如下：

@Entry
@Component
struct TextPage {
  @State message: string = 'Hello World';
  private allText: string = '冰冻三尺非一日之寒'
  private changeText: string[] = ['冰', '尺', '一']

  build() {
    RelativeContainer() {
      Text() {
        ForEach(this.allText.split(""), (item: string) => {
          Span(item)
            .fontSize(this.changeText.includes(item) ? 30 : 16)
            .fontColor(this.changeText.includes(item) ? Color.Red : Color.Black)
        }, (item: string) => item)
      }
    }
    .height('100%')
    .width('100%')
  }
}