Floating bars charts

Dear All,
I'm trying to create a bar chart where the bars' bottom points may be different from 0. This article (if I understood it correctly) suggests that it might be possible with Charts.js by giving the "data" array like this data: [[5,6], [-3,-6]], but when I try to do that in Node-Red, what I get are the bars starting at 0 and ending at the first elements of the arrays.
Is it possible at all to create such kind of barchart with Node-Red?
Thanks in advance!

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