How to implement d3.js donut chart?

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<script src="https://d3js.org/d3.v7.min.js"></script>

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<svg id="chart"></svg>

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var data = [
  {category: "Category 1", value: 30},
  {category: "Category 2", value: 50},
  {category: "Category 3", value: 20}
];

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var width = 400;
var height = 400;
var radius = Math.min(width, height) / 2;

var color = d3.scaleOrdinal(d3.schemeCategory10);

var svg = d3.select("#chart")
  .attr("width", width)
  .attr("height", height)
  .append("g")
  .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

var pie = d3.pie()
  .value(function(d) { return d.value; })
  .sort(null);

var arc = d3.arc()
  .innerRadius(radius - 100)
  .outerRadius(radius - 50);

var path = svg.selectAll("path")
  .data(pie(data))
  .enter()
  .append("path")
  .attr("d", arc)
  .attr("fill", function(d, i) {
    return color(i);
  });

var legend = svg.selectAll(".legend")
  .data(data)
  .enter()
  .append("g")
  .attr("class", "legend")
  .attr("transform", function(d, i) {
    return "translate(-50," + (i * 20 - 50) + ")";
  });

legend.append("rect")
  .attr("x", width - 18)
  .attr("width", 18)
  .attr("height", 18)
  .attr("fill", function(d, i) {
    return color(i);
  });

legend.append("text")
  .attr("x", width - 24)
  .attr("y", 9)
  .attr("dy", ".35em")
  .style("text-anchor", "end")
  .text(function(d) {
    return d.category;
  });