[Chartjs]-Adding custom text to Bar Chart label values using Chart.js

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You can use the plugin chartjs-datalabels and set the formatter property to set your custom labels.

Created a fiddle for your reference -> http://jsfiddle.net/upmth2cq/1/

Hope it helps! 

new Chart(document.getElementById("barChartHeadcount"), {
  type: 'bar',
  data: {
    labels: ['Jan', 'Feb', 'Mar'],
    datasets: [{
      label: 'Billed',
      backgroundColor: 'rgb(0, 197, 106)',
      data: [56, 63, 67]
    }, {
      label: 'Unbilled',
      backgroundColor: 'rgb(255, 114, 107)',
      data: [1, 2, 3]
    }]
  },
  options: {
    title: {
      display: true,
      text: 'Community Headcount'
    },
    tooltips: {
      mode: 'index',
      intersect: false
    },
    responsive: true,
    scales: {
      xAxes: [{
        stacked: false
      }],
      yAxes: [{
        stacked: false
      }]
    },
    plugins: {
      datalabels: {
        align: 'end',
        anchor: 'end',
        backgroundColor: function(context) {
          return context.dataset.backgroundColor;
        },
        borderRadius: 4,
        color: 'white',
        formatter: function(value){
            return value + ' (100%) ';
        }
      }
    }
  }
});

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