Request for option bar chart with region

I had tried to use region option with bar chart, it work but the result is not so precise as you had did with line chart. Is that possible to add an option bar chart with regions. I would propose using gradient or fill pattern with the selected region. Thanks.

Start by tracing how the existing region option is handled for line charts, then compare it with the bar chart rendering entry point. Done means bar charts support regions with a clear gradient or fill-pattern treatment and the option behaves as precisely as the line-chart version.

Written by the indexing model from the issue text.