Export CSV for single embeded chart with iframe

I’d like to know if there is any possibility to export data in CSV from a single embedded chart.
From my testing it seems that the only possibility is to share the entire dashboard, but i my case I need to share just one of the chart.
It would be nice to have the export in CSV functionality also on one single iframe embed chart.

Can you give me some advice on how I could get the data from the embed chart iframe? Maybe in javascript?