@cutu234 you may check if this is supported out of the box in the google visualization API’s (https://developers.google.com/chart/interactive/docs/reference) option. If it is, then it is possible to apply this using the manual configuration option.
For directly working on the <rect> element, you can add your own CSS code through the theme without needing the pro version.
Thank you very much. Actually, it was much easier than I thought. You can check the transparency checkbox for the chart area and then apply a gradient to the .visualizer-front class. Works perfectly fine.
@cutu234 that’s a super solution!
I will mark this as resolved.
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