如何在children里面获得父级Mark通过X通道细分的data，做进一步分解？使我能在分面图中实现多指标。

[ChristmasFox]

如何在children里获得父级data，例如

const data = [
  {"city":"厦门市", q1Children: [
      {"city":"厦门市","goods_categories":"日用品","gross":2005.54},
      {"city":"厦门市","goods_categories":"零食","gross":295.43},
      {"city":"厦门市","goods_categories":"生鲜","gross":3450.61}
    ], q2Children: [
      {"city":"厦门市","goods_categories":"日用品",type: "A","cost":2005.54},
      {"city":"厦门市","goods_categories":"日用品",type: "B","cost":2005.54},
      {"city":"厦门市","goods_categories":"零食",type: "A","cost":295.43},
      {"city":"厦门市","goods_categories":"生鲜",type: "A","cost":3450.61}
    ] },

  {"city":"泉州市", q1Children: [
      {"city":"泉州市","goods_categories":"日用品","gross":2005.54},
      {"city":"泉州市","goods_categories":"零食","gross":295.43},
      {"city":"泉州市","goods_categories":"生鲜","gross":3450.61}
    ], q2Children: [
      {"city":"泉州市","goods_categories":"日用品",type: "A","cost":2005.54},
      {"city":"泉州市","goods_categories":"日用品",type: "B","cost":2005.54},
      {"city":"泉州市","goods_categories":"零食",type: "A","cost":295.4},
      {"city":"泉州市","goods_categories":"生鲜",type: "A","cost":3450.61}
    ] }
]

chart.options({
  type: "facetRect",
  width: 928,
  height: 320,
  paddingLeft: 60,
  paddingBottom: 60,
  data,
  encode: { x: "city" }, // 现通过city字段分面， 子集是两个指标
  children: [
    {
      type: "point",
      inset: 10,
      data:  '?' ,// 这里的data能不能分别取到当前分面（厦门或泉州）的q1Children里的数据
      encode: { x: 'goods_categories', y: "gross" },
      style: { stroke: "#000" },
    },
    {
      type: "point",
      inset: 10,
      data:  '?',
      encode: { x: 'goods_categories', y: "cost" },
      style: { stroke: "#000" },
    }
  ],
});