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This solution is not working anymore:
Chart.js v2: space between doughnut inside doughnut
but i found another one that works just adding empty data between
Padding Between Pie Charts in chart js
const colors = ["#FF6384", "#36A2EB", "#FFCE56"];
var pieChart = new Chart("myChart", {
type: 'pie',
data: {
labels: ["Red", "Blue", "Yellow"],
datasets: [{
data: [8, 5, 6],
backgroundColor: colors,
},{
weight: 0.2
},{
data: [5, 7, 4],
backgroundColor: colors,
weight: 1.2
}]}})
Source:stackexchange.com