HarmonyOS 如何从*.ttf 的字体文件中提取出里面的图片给Image组件用？

import font from '@ohos.font';  
@Entry  
@Component  
struct Index {  
  @State message: string = 'Hello World';  
  
  aboutToAppear() {  
  
    font.registerFont({  
      familyName: 'iconfont',  
      familySrc: $rawfile('iconfont.ttf')  
    })  
  }  
  build() {  
    Row() {  
      Column() {  
        Text("1")  
  
        Text("\u002f")  
          .fontSize(50)  
          .fontWeight(FontWeight.Bold)  
          .fontFamily("iconfont")  
      }  
      .width('100%')  
    }  
    .height('100%')  
  }  
}