为啥设置了borderColor和BorderStyle后，边框不显示？

Text("Hello 张三")
  .fontSize(30)
  .padding(20)
  .textAlign(TextAlign.Center)
  .borderImage({
    source: {
      angle: 90,
      direction: GradientDirection.Left,
渐变色设置
    },
    slice: { top: 10, bottom: 10, left: 10, right: 10 },
设置边框宽度
  })