Is your feature request related to a problem? Please describe.
I tried to set a dark color and decrease symbol size for BarCanvas legends but changing the configuration didn't affect the chart. I found the cause in the repository, the symbol size and the color are hardcoded in the source code of BarCanvas:
![Képernyőkép erről: 2020-04-24 11-22-18](https://user-images.githubusercontent.com/32