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Concentric doughnuts are implemented in Chart.js 2.0. There is an example in the 2.0.0-alpha3 tagged commit – https://github.com/nnnick/Chart.js/blob/2.0.0-alpha3/samples/doughnut.html
var config = {
type: 'doughnut',
...
With Chart.js 2.0, doughnut charts are more alike line and bar charts in that they support multiple series – each series becoming a concentric circle.
Fiddle – https://jsfiddle.net/zuupzpLL/
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Source:stackexchange.com