Variable-radius nested donut chart

by martinsrodrigoaugusto806

HTML

<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>

CSS

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 500px;
}

JavaScript

/**
 * ---------------------------------------
 * This demo was created using amCharts 4.
 * 
 * For more information visit:
 * https://www.amcharts.com/
 * 
 * Documentation is available at:
 * https://www.amcharts.com/docs/v4/
 * ---------------------------------------
 */

// Themes begin
am4core.useTheme(am4themes_animated);
// Themes end

// Create chart instance
var chart = am4core.create("chartdiv", am4charts.PieChart);
chart.startAngle = 160;
chart.endAngle = 380;

// Let's cut a hole in our Pie chart the size of 40% the radius
chart.innerRadius = am4core.percent(40);

// Add data
chart.data = [{
  "Total": "Comparativo",
  "Webex": 750,
  "Broadworks": 5600
}];

// Add and configure Series
var pieSeries = chart.series.push(new am4charts.PieSeries());
pieSeries.dataFields.value = "Webex";
pieSeries.dataFields.category = "Total";
pieSeries.slices.template.stroke = new am4core.InterfaceColorSet().getFor("background");
pieSeries.slices.template.strokeWidth = 1;
pieSeries.slices.template.strokeOpacity = 1;

// Disabling labels and ticks on inner circle
pieSeries.labels.template.disabled = true;
pieSeries.ticks.template.disabled = true;

// Disable sliding out of slices
pieSeries.slices.template.states.getKey("hover").properties.shiftRadius = 0;
pieSeries.slices.template.states.getKey("hover").properties.scale = 1;
pieSeries.radius = am4core.percent(40);
pieSeries.innerRadius = am4core.percent(30);

var cs = pieSeries.colors;
cs.list = [am4core.color(new am4core.ColorSet().getIndex(0))];

cs.stepOptions = {
  lightness: -0.05,
  hue: 0
};
cs.wrap = false;


// Add second series
var pieSeries2 = chart.series.push(new am4charts.PieSeries());
pieSeries2.dataFields.value = "Broadworks";
pieSeries2.dataFields.category = "Total";
pieSeries2.slices.template.stroke = new am4core.InterfaceColorSet().getFor("background");
pieSeries2.slices.template.strokeWidth = 1;
pieSeries2.slices.template.strokeOpacity =...