Chartjs-Show Labels on Pie pieces instead of Data values Chart.js

You can find the answer in the docs of the plugin:
https://chartjs-plugin-datalabels.netlify.com/guide/formatting.html#custom-labels

options: {
  plugins: {
    datalabels: {
      formatter: function(value, context) {
        return context.chart.data.labels[context.dataIndex];
      }
    }
  }
}

The dev simonbrunel explained on GitHub how you can disable the plugin globally or for specific datasets. The following is a quote from the GitHub link:

That should be possible by disabling labels for all datasets via the plugin options at the chart level using the display option, then enable labels per dataset at the dataset level (dataset.datalabels.*):

new Chart('id', {
  data: {
    datasets: [{
      // no datalabels for this dataset
    }, {
        datalabels: {
          // display labels for this specific dataset
          display: true
        }
    }
  },
  options: {
    plugins: {
      datalabels: {
         // hide datalabels for all datasets
         display: false
      }
    }
  }
})

You can also globally disable labels for all charts using:

// Globally disable datalabels
Chart.defaults.global.plugins.datalabels.display = false