Tree map with levels

by Black Label

HTML

<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&display=swap" rel="stylesheet">

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/treemap.js"></script>

<div id="container"></div>

JavaScript

Highcharts.theme = {
  colors: [
    "#2D2357",
    "#4B3A7D",
    "#614FA2",
    "#7765C7",
    "#8E7BED",
    "#A392F5",
    "#B8A8FF",
    "#CCC0FF",
    "#E0D9FF"
  ],
  chart: {
    panning: {
      enabled: false
    },
    zooming: {
      mouseWheel: {
        enabled: false
      }
    },
    style: {
      fontFamily: 'Montserrat, sans-serif'
    },
  },
  credits: {
    enabled: false
  },
  title: {
    style: {
      fontWeight: 'normal',
      color: 'black',
      fontSize: '16px'
    }
  },
  legend: {
    symbolRadius: 0,
    itemStyle: {
      fontWeight: 'normal',
      color: 'black',
      fontSize: '12px'
    }
  },
  plotOptions: {
    series: {
      borderRadius: 0,
      borderWidth: 0.5,
      borderColor: null,
      dataLabels: {
        style: {
          fontWeight: 'normal',
          color: 'black',
          fontSize: '12px'
        }
      }
    }
  },
  xAxis: {
    title: {
      style: {
        fontSize: 14,
        fontWeight: 'normal',
        color: 'black',
      }
    },
    labels: {
      style: {
        fontSize: 12,
        fontWeight: 'normal',
        color: 'black',
      }
    }
  },
  yAxis: {
    title: {
      style: {
        fontSize: 14,
        fontWeight: 'normal',
        color: 'black',
      }
    },
    labels: {
      style: {
        fontSize: 12,
        fontWeight: 'normal',
        color: 'black',
      }
    }
  }
};

Highcharts.setOptions(Highcharts.theme);

Highcharts.chart('container', {
  credits: {
    enabled: false
  },
  series: [{
    type: 'treemap',
    layoutAlgorithm: 'stripes',
    alternateStartingDirection: true,
    borderColor: '#fff',
    borderWidth: 1,
    dataLabels: {
      style: {
        textOutline: 'none',
                color: 'white',
        fontSize: '14px'
      }
    },
    levels: [{
      level: 1,
      layoutAlgorithm: 'strip',
      dataLabels: {
        enabled: true,
        align: 'left',
        verticalAlign: 'top',
        style: {
         ...