Chartjs-How to make labels on both side from horizontal bar chart js

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You can obtain the desired result by defining a second y-axis as follows:

{
  type: 'category',
  position: 'right',
  offset: true,
  ticks: {
    reverse: true,
  },
  gridLines: {
    display: false
  }
}

Please take a look at your amended and runnable code below:

new Chart(document.getElementById('canvas'), {
  type: 'horizontalBar',
  data: {
    labels: ['0-4', '5-9', '10-14', '15-19', '20+'],
    datasets: [{
        label: 'Pasien Masuk',
        data: [100, 90, 80, 70, 60],
        backgroundColor: 'red',
      },
      {
        label: 'Pasien Keluar',
        data: [-100, -75, -60, -75, -70],
        backgroundColor: 'blue',
      },
    ]
  },
  options: {
    responsive: true,
    title: {
      display: true,
      text: 'Data Pasien Keluar Masuk',
      fontSize: 20,
    },
    legend: {
      position: 'bottom',
    },
    tooltips: {
      callbacks: {
        label: (tooltipItem, data) => {
          let ds = data.datasets[tooltipItem.datasetIndex];
          return ds.label + ': ' + Math.abs( ds.data[tooltipItem.index]);
        }
      }
    },
    scales: {
      xAxes: [{
        stacked: true,
        ticks: {
          callback: value => Math.abs(value)
        }
      }],
      yAxes: [{
        stacked: true,
        ticks: {
          reverse: true,
        }
      },
      {
        type: 'category',
        position: 'right',
        offset: true,
        ticks: {
          reverse: true,
        },
        gridLines: {
          display: false
        }
      }]
    }
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="canvas" height="100"></canvas>

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