Amcharts-如何水平对齐多个系列的圆形气泡

var chart = am4core.create("chartdiv", am4charts.XYChart);
chart.dataSource.url = "data.json";

var series1 = chart.series.push(new am4charts.ColumnSeries());
series1.dataFields.valueY = "value1";
series1.dataFields.categoryX = "category";
series1.columns.template.tooltipText = "{categoryX}: [bold]{valueY}[/]";
series1.columns.template.fill = am4core.color("#FF0000");

var series2 = chart.series.push(new am4charts.ColumnSeries());
series2.dataFields.valueY = "value2";
series2.dataFields.categoryX = "category";
series2.columns.template.tooltipText = "{categoryX}: [bold]{valueY}[/]";
series2.columns.template.fill = am4core.color("#00FF00");

chart.xAxes.push(new am4charts.CategoryAxis());
chart.yAxes.push(new am4charts.ValueAxis());

chart.legend = new am4charts.Legend();

series1.columns.template.width = am4core.percent(50);
series2.columns.template.width = am4core.percent(50);