[Chartjs]-How to add new dataset in line chart of chart.js by iterating over dictionary in JavaScript?

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Given the data is available in the variable health, you can extract the labels through Object.keys() as follows.

labels: Object.keys(health),

The data of individual datasets can be extracted through Object.values(), followed by Array.map(). The data of the first dataset for example is defined as follows.

data: Object.values(health).map(v => v[0]),

Please have a look at your amended and runnable code below.

const health = {
  "2020": [1, 2, 3],
  "2021": [4, 5, 6]
}

var myLineChart = new Chart('myChart', {
  type: 'line',
  data: {
    labels: Object.keys(health),
    datasets: [{
        label: "Pass",
        data: Object.values(health).map(v => v[0]),
        backgroundColor: 'rgba(71,193,28, 0.71)',
        borderColor: 'rgb(71,193,28)',
        fill: false
      },
      {
        label: "Failed",
        data: Object.values(health).map(v => v[1]),
        backgroundColor: 'rgba(212,0,13,0.71)',
        borderColor: 'rgb(212,0,13)',
        fill: false
      },
      {
        label: "Skipped",
        data: Object.values(health).map(v => v[2]),
        backgroundColor: 'rgba(228,78,231,0.56)',
        borderColor: 'rgb(228,78,231)',
        fill: false
      }
    ]
  },
  options: {
    responsive: true,
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true,
          stepSize: 1
        }
      }]
    }
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart" height="80"></canvas>

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