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I think that a posible solution could be use some kind of Stacked Bar.
But chart.js doesn’t support that out of the box, It looks like that you need the a fork of chart.js called chartnew.js that allow stacked bar which could give you this two colors in the same bar and many other options. Take a look at the github page of the project
https://github.com/FVANCOP/ChartNew.js/
I hope it helps
Source:stackexchange.com