Chartjs-How to implement concentric doughnut charts in polymer 1.0 using Chart.js?

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/