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I am not sure if you can apply three colors to the same “bar” (which is a relative term here). But I do know you have the ability to create stacked charts like in this example here:
https://www.chartjs.org/samples/latest/charts/bar/stacked.html
The key is to pass the stacked property as true when setting your chart options. Example:
...
options: {
title: {
display: true,
text: 'Chart.js Bar Chart - Stacked'
},
tooltips: {
mode: 'index',
intersect: false
},
responsive: true,
scales: {
xAxes: [{
// MAGIC HERE
stacked: true,
}],
yAxes: [{
// AND HERE
stacked: true
}]
}
}
I hope this can help you.
Source:stackexchange.com