[Chartjs]-Disable stacking for 1 dataset

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You can specify the stacks in the datasets. If you assign all datasets to the same stack except for your brown one you get what you want:

var options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderColor: 'pink',
        stack: 'stack2'
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderColor: 'orange',
        stack: 'stack1'
      },
      {
        label: '# of Points',
        data: [5, 5, 5, 5, 5, 5],
        borderColor: 'turquoise',
        stack: 'stack1'
      }
    ]
  },
  options: {
    scales: {
      y: {
        stacked: true
      }
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.js"></script>
</body>

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