how create column chart and radial gauges with shadows

### Use case

create column chart and radial gauge with shadow and gradient

### Proposal

hello,
I want to create those chart and gauge, how can i do this?

No file, test, entry point, or concrete API change is named. Start by checking how the library currently supports column charts, radial gauges, shadows, and gradients, then clarify whether the request is for usage guidance or new functionality. Done requires an agreed implementation or documented example with the requested visual results.

Written by the indexing model from the issue text.