From a drilldown config

import WestCoastCharts from 'west-coast-charts'
import types from 'west-coast-charts/types'

WestCoastCharts.use(types)

const options = {
  chart: {
    height: 360,
    fontFamily: "Inter, Geist, \"IBM Plex Sans\", system-ui, sans-serif",
    type: "icicle",
    toolbar: {
      show: false
    }
  },
  series: [
    {
      name: "Tickets",
      data: [
        {
          x: "Billing",
          y: 340,
          drilldown: "b"
        },
        {
          x: "Login",
          y: 220,
          drilldown: "l"
        },
        {
          x: "Other",
          y: 90
        }
      ]
    }
  ],
  drilldown: {
    series: [
      {
        id: "b",
        data: [
          {
            x: "Refunds",
            y: 180
          },
          {
            x: "Invoices",
            y: 160
          }
        ]
      },
      {
        id: "l",
        data: [
          {
            x: "Password",
            y: 140
          },
          {
            x: "2FA",
            y: 80
          }
        ]
      }
    ]
  },
  plotOptions: {
    icicle: {
      direction: "right",
      zoomType: "both",
      tint: 0.16,
      dataLabels: {
        showValue: true
      }
    }
  },
  title: {
    text: "Support tickets by topic"
  },
  theme: {
    mode: "light",
    preset: "coastal"
  }
}

const chart = new WestCoastCharts(document.querySelector('#chart'), options)
await chart.render()