如何设置边框的颜色为渐变色？

Text("Hello 张三")
  .fontSize(30)
  .padding(20)
  .textAlign(TextAlign.Center)
  .borderImage({
    source: {
      angle: 90,
      direction: GradientDirection.Left,
      colors: [[0xFF0000, 0.0], [0x00FF00, 0.5], [0x0000FF, 1.0]]//渐变色设置
    },
    slice: { top: 10, bottom: 10, left: 10, right: 10 },
    width: { top: "10px", bottom: "10px", left: "10px", right: "10px" },//设置边框宽度
  })