score:22

Accepted answer

Looking at the docs, I can see that multiline labels are possible.

Updated link to documentation: https://www.chartjs.org/docs/latest/general/data-structures.html

I looked at the source code of an example and for multiline labels, they have each multiline in an array where each element of the array is rendered in its own line.

For example:

labels: [['(A)', 'Waking'], '(B)', '(C)', '(D)'],

See DEMO below:

var randomScalingFactor = function() {
  return Math.round(Math.random() * 100);
};

window.chartColors = {
    red: 'rgb(255, 99, 132)',
    orange: 'rgb(255, 159, 64)',
    yellow: 'rgb(255, 205, 86)',
    green: 'rgb(75, 192, 192)',
    blue: 'rgb(54, 162, 235)',
    purple: 'rgb(153, 102, 255)',
    grey: 'rgb(201, 203, 207)'
};

var config = {
  type: 'line',
  data: {
    labels: [
      ['(A)', 'Walking'], '(B)', '(C)', '(D)'],
    datasets: [{
      label: 'My First dataset',
      fill: false,
      backgroundColor: window.chartColors.red,
      borderColor: window.chartColors.red,
      data: [
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor()        
      ]
    }, {
      label: 'My Second dataset',
      fill: false,
      backgroundColor: window.chartColors.blue,
      borderColor: window.chartColors.blue,
      data: [
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor()
      ],
    }]
  },
  options: {
    responsive: true,
    title: {
      display: true,
      text: 'Chart with Multiline Labels'
    },
  }
};

window.onload = function() {
  var ctx = document.getElementById('canvas').getContext('2d');
  window.myLine = new Chart(ctx, config);
};
<script src="https://www.chartjs.org/dist/2.8.0/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://ajax.cloudflare.com/cdn-cgi/scripts/a2bd7673/cloudflare-static/rocket-loader.min.js" data-cf-settings="100752039a7e60f6a2c8f47d-|49"></script>

<div style="width:90%;">
  <canvas id="canvas"></canvas>
</div>


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