score:6

Accepted answer

Use a callback for xAxes into your options:

options: {
  responsive: true,
  title:{
      display: true,
      text:'Chart.js Bubble Chart'
  },    
  scales: {
    xAxes: [{
      ticks: {
        callback: function(value, index, values) {
          return 'value is ' + value;
        }
      }
    }]
  }
}

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