如何在使用amCharts执行事件侦听器clickGraphItem时引用JavaScript对象数组中的变量

var data = [
  { name: "John", age: 25 },
  { name: "Jane", age: 30 },
  { name: "Bob", age: 35 }
];

var chart = am4core.create("chartdiv", am4charts.XYChart);

// 设置图表的数据源为data数组
chart.data = data;

// 创建柱状图的系列
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.valueY = "age";
series.dataFields.categoryX = "name";

// 添加clickGraphItem事件的侦听器
series.columns.template.events.on("hit", function(ev) {
  // 获取点击的柱子对应的数据项
  var dataItem = ev.target.dataItem.dataContext;
  
  // 输出姓名和年龄
  console.log("Name: " + dataItem.name);
  console.log("Age: " + dataItem.age);
});