score:2

Accepted answer

based on documentation, you can use:

labels: {
  render: function (args) {
    // { label: 'label', value: 123, percentage: 50, index: 0, dataset: {...} }
    // index - datasetindex
    if (args.index == 1) {
       return { src: 'url', width: 25, height: 25 };
    }

    return undefined;
  },
},

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