Chartjs-Pie Charts JS: How to set units?

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You will have to use a custom tooltip callback like this:

  options: {
    plugins: {
        tooltip: {
        callbacks: {
            label: (ttItem) => (`${ttItem.label}: Rp. ${ttItem.parsed}`)
        }
      }
    }
  }

Documentation: https://www.chartjs.org/docs/latest/configuration/tooltip.html#tooltip-callbacks

V2:

  options: {
    tooltips: {
        callbacks: {
        label: (ttItem, items) => (`${items.labels[ttItem.index]}: R. ${items.datasets[ttItem.datasetIndex].data[ttItem.index]}`)
      }
    }
  }

Example V3:

var options = {
  type: 'pie',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, 3, 5, 2, 3],
      borderWidth: 1
    }]
  },
  options: {
    plugins: {
      tooltip: {
        callbacks: {
          label: (ttItem) => (`${ttItem.label}: Rp. ${ttItem.parsed}`)
        }
      }
    }
  }
}

var 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/3.2.0/chart.js"></script>
</body>

Example V2:

var options = {
  type: 'pie',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, 3, 5, 2, 3],
      borderWidth: 1
    }]
  },
  options: {
    tooltips: {
      callbacks: {
        label: (ttItem, items) => (`${items.labels[ttItem.index]}: R. ${items.datasets[ttItem.datasetIndex].data[ttItem.index]}`)
      }
    }
  }
}

var 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/2.8.0/Chart.js"></script>
</body>

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