Use transparent background and borders by default in pie chart

[yhojann-cl]

Would you like to work on this feature?

• Check this if you would like to implement a PR, we are more than happy to help you go through the process.

What problem are you trying to solve?

It would be simpler if by default the pie chart used a transparent background and border separator color by default, in my case I have a website with dynamic background colors and light and dark themes, it is cumbersome to have to manipulate each color manually in each chart instead of simply enabling the use of transparencies by default.

I try use backgroundColor: 'transparent' and works fine, but pieSliceBorderColor: 'transparent' does not work.

Describe the solution you'd like

By default the graphs use a transparent color or detect light and dark css theme on browser.

Describe alternatives you've considered

No response

Documentation, Adoption, Migration Strategy

No response