Chartjs-ChartJS: Custom legend not showing Labels for Multi-Pie chart

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To gather labels from all datasets, you should include all datasets into your loop:

for(var j = 0; j < chart.data.datasets.length; j++){
  for (var i = 0; i < chart.data.datasets[j].data.length; i++) {
      text.push('<li class="list-inline-item"><small><i class="fas fa-circle pr-1" style="color:' +
              chart.data.datasets[j].backgroundColor[i] + '"></i>');
      if (chart.data.datasets[j].labels[i]) {
          text.push('<span class="font-weight-bold">' + chart.data.datasets[j].labels[i] + '</span>');
      }
      text.push('</small></li>');
  }
}

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