Chartjs-Chart JS: is possible mix Scatter and bar chart in Chart JS?

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Yes this is possible by using a second x axis with the same labels but the offset and display set to false:

const labels = ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"];

const options = {
  type: 'bar',
  data: {
    labels,
    datasets: [{
        type: 'line',
        xAxisID: 'x2',
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderColor: 'orange',
        backgroundColor: 'orange'
      },
      {
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderColor: 'pink',
        backgroundColor: 'pink'
      }
    ]
  },
  options: {
    scales: {
      x: {},
      x2: {
        labels,
        offset: false,
        display: false
      }
    }
  }
}

const 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/3.5.1/chart.js"></script>
</body>

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