如何在canvasxpress Scatter3D的图表中为每个类保持固定的colorBy？

// 创建Scatter3D图表实例
var cx = new CanvasXpress("chartContainer", {
  y: {
    data: {
      x: ["A", "B", "C", "D"],
      y: [
        [1, 2, 3, 4],
        [5, 6, 7, 8],
        [9, 10, 11, 12],
        [13, 14, 15, 16]
      ],
      s: [
        [10, 20, 30, 40],
        [50, 60, 70, 80],
        [90, 100, 110, 120],
        [130, 140, 150, 160]
      ],
      category: ["Class1", "Class2", "Class1", "Class2"] // 添加表示类别的列
    },
    smpLabel: ["Sample1", "Sample2", "Sample3", "Sample4"]
  },
  marks: {
    mode: "scatter3D",
    colorBy: "category" // 设置颜色的基准为"category"列
  }
});

// 渲染图表
cx.render();