In this case I think it would be best to include Chart.js in your project as an external library and script the chart yourself. This way you will have full control over your chart and data. There are lots of examples online on how to pass external xml/json to Chart.js instances, so it will be a matter of copy/pasting some JS and adapting it to work.
I would also find that very practical.
I have large amounts of data in xml files that I want to display in charts, and they changing often. Its to much to get it in manually.
A option to select a (xml) file or to import xml code was verry nice!