Hello,
I don't have much experience with Data-Driven content, but would this link be helpful?
https://medium.com/@chaitusince1992/exporting-d3-charts-to-pdf-3b2925aae967
I think any generic solution for printing D3 (or whatever language you are using) charts should work within VA.
Let us know if you have any luck with that.
Thanks,
Sam
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