Passing parameter/value/variable from dataset to main report?

[tonyy]

This question was asked 8 years ago... however no solution proposed I hope something has changed. I want to retrieve values from each dataset of every chart, then agreggate it and make it available to chart customizer.  So I need a way to freely be able to access main report parameters from different datasets and vice versa(access datasets parameters from main report).

To jasper developers: how could you forget about colour consistency across multiple charts? Enterprise uber critical requirement! You possible now realise what I am trying to do and how painful it is.