How does Mini Program use echarts-for-weixin to send a request to modify data?

import * as echarts from "../../ec-canvas/echarts";

function initChart(canvas, width, height) {
  const chart = echarts.init(canvas, null, {
    width: width,
    height: height
  });
  canvas.setChart(chart);

  var option = {
    //
    tooltip: {
      trigger: "item",
      formatter: "{a} <br/>{b}: {c} ({d}%)"
    },
    //
    legend: {
      selectedMode: false,  //
      orient: "horizontal",  //    vertical
      width: 100,   //,
      x: "50%",   //
      y: "center",   //
      data: ["", "", "", "", ""],
      textStyle: {    //
        color: "-sharp333",  //
        fontSize: 12    //
      },
      itemWidth: 12,
      itemHeight: 12
    },
    // 
    color: ["-sharp62d1de", "-sharp54d6b6", "-sharpa6db69", "-sharpffd454", "-sharpffa361", "-sharpd1d1d1"],
    series: [
      {
        name: "", //
        type: "pie", //
        center: ["25%", "50%"], //
        radius: ["50%", "70%"], //
        avoidLabelOverlap: false,
        label: {
          normal: {
            show: false,
            position: "center"
          },
          emphasis: {
            show: true,
            textStyle: {
              fontSize: "16",
              fontWeight: "bold"
            }
          }
        },
        labelLine: {
          normal: {
            show: false
          }
        },
        data: [
             {value: 335, name: ""},
             {value: 310, name: ""},
             {value: 234, name: ""},
           {value: 135, name: ""},
           {value: 1548, name: ""}
         ]
      /*
        (function () {
          var arr1 = [];
          wx.request({
            url: "https://www.baifubao.com/callback?cmd=1059&callback=phone&phone=13854322342",
            method: "post",
            dataType: "json",
            success: res => {
              console.log(2323);
              arr1 = [
                { value: 335, name: "" },
              { value: 310, name: "" }
              ]
            },
            fail: function (a) {
              console.log(a)
              arr1 = [
                { value: 335, name: "" },
                { value: 310, name: "" }
              ]
            }
          })
          console.log(arr1)
          return arr1
        })()
        */
      }
    ]
  };

  chart.setOption(option);
  return chart;
}

// pages/bill/history.js
Page({

  /**
   * 
   */
  data: {
    datetabs: [],
    ec: {
      onInit: initChart
    },
    selectedIdx: 0
  },
how can the function outside page {} get the data value in the function to modify?