uplot sample fixed

HTML

<!doctype html>
<html>
	<head>
		<meta charset="utf-8">
		<link rel="stylesheet" href="https://leeoniya.github.io/uPlot/dist/uPlot.min.css">
    <style>
    .table {display: flex; flex-direction: row;}
    .table > div {margin-right: 20px}
    </style>
  </head>
	<body>
		<script src="https://leeoniya.github.io/uPlot/dist/uPlot.iife.js"></script>
    <div class="table">
      <div>
            <div>Y Scale's: data min=<span id="ydmin"></span> / visual min=<span id="ysmin"></span></div>
    <div>Y Scale's: data max=<span id="ydmax"></span> / visual max=<span id="ysmax"></span></div>
      </div>
      <div>
          <div>R Scale's: data min=5 / visual min=<span id="rsmin"></span></div>
    <div>R Scale's: data max=22 / visual max=<span id="rsmax"></span></div>
      </div>
    </div>

    <div id="chart"></div>
  
	</body>
</html>

JavaScript

const data = [
	[1, 2, 3],
  [10, 20, 30],
  [20, 5, 22],
];

const series = [
  	{},
    {stroke: 'rgb(256, 0, 0)', scale: 'y'},
    {stroke: 'rgb(0, 0, 256)', scale: 'r'},
];

series.forEach((s, i) => {
	if (i > 0) {
	  s.sum = data[i].reduce((a, b) => a + b, 0);
		s.avg = s.sum / data[i].length;
  }
});

window.u = new uPlot({
	width: 600,
  height: 400,
  scales: {
  	y: {
      range: (_, min, max) => {
      	 window.ydmin.innerText = min;
         window.ydmax.innerText = max;
         return [0, 100];
      }
    },
    r: {},
  },
  axes: [{}, {}, {scale: 'r', side: 1, stoke: 'red'}],
  hooks: {
     ready: [(i) => {
        window.ysmin.innerText = i.scales.y.min;
        window.ysmax.innerText = i.scales.y.max;
        window.rsmin.innerText = i.scales.r.min;
        window.rsmax.innerText = i.scales.r.max;
     }]
  },
  plugins: [{
    hooks: {
    	init: (_, opts, data) => {
					/** This is not working */
      		data.forEach((d, i) => {
          		if (i > 0) {
              	opts.series[i].sum = d.reduce((a, b) => a + b, 0)
              	opts.series[i].avg = opts.series[i].sum / d.length;
              }
          })
      }
    }
  }],
  series,
}, data, window.chart)