I don't know how to incorporate the Chart.js script in a tiddlywiki but a workaround would be be to include them in a tiddler via an iframe eg:
<iframe src="http://address.of.my.chart" width="400" height="300" style="border: none;"></iframe> Good luck Ben -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/groups/opt_out.

