Adding a gradient to bar charts

Hi everyone,

Really loving this library. I want to create a bar chart that looks like this:

I have searched through all of the issues, read through the API, and I looked around GitHub for examples .

Really appreciate your time!

Start by reviewing the bar-chart API and the existing examples mentioned in the issue to determine whether gradient fills are already supported. The issue does not identify a file, entry point, or acceptance criteria; completion would require clarifying whether the goal is usage guidance or a new charting capability and defining the expected result.

Written by the indexing model from the issue text.