下面的代码，我想更改series.name的颜色，还有其他方法可以更改series.name的颜色吗？ 代码示例是

    series1.yAxis = valueAxis1;
    series1.name = "Target Sales";  //I want to change the color of the label e.g Target Sales here 

    series1.tooltipText = "{name}\n[bold font-size: 20 ]${valueY}M[/]";
    series1.fill = chart.colors.getIndex(0);
    series1.strokeWidth = 0;
    series1.clustered = false;
    series1.columns.template.width = am4core.percent(40);