Different colors for different visuals in JSON theme for Power Bi

Hi team,

I'm trying to build a customised json theme for my power bi report and its' new for me. As per my understanding till now I only knew we can take only  one specific set of data colours which would apply the same set to all visuals in the report.

But, the requirement is "each visual should have different set of data colours" and i'm unable to find relavent solution for it. 

The different color approach should be completely from JSOn code and not manually from Power Bi.

Please help me in finding the solution for this at the earliest.

Regards,

Haveesh