Custom colors for waterfall chart type

PwC

Currently, the waterfall chart type is one of the only bar chart types that does not allow for custom bar colors via the Color Rules tab. I know we have some limited options for color customization with waterfall charts but these options impose some limitations in their current implementation. For example, when representing financial data, we currently cannot distinguish between different categories of expenses or revenue; we can distinguish between positive and negative data values but not between discrete categories within those buckets.

Given that waterfall charts are intended (again in a financial context) to help visualize the piecemeal contributions of multiple sources of income/loss relative to the net revenue it would be helpful to customize the colors of those sources to match the way they are represented in other cards. I wanted to see if it would be possible to enable this functionality for waterfall chart types given that it seems to exist for most, if not all, of the other bar-based chart types.