Highchart: A string of JavaScript which we eval as the payload

highchart.js

{
  chart: {
    style: {
      color: "#b9bbbb"
    },
  },
  series: [{
    color: "#108ec5",
    name: "New York",
    data: [17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5]
  }, {
    color: "#52b238",
    name: "Berlin",
    data: [13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0]
  }, {
    color: "#ee5728",
    name: "London",
    data: [11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
  }]
}