Currently the “Range” scale markers available in line chart types allow users to choose a fill color for Y-axis values within a selected range. It would be helpful to choose upper and lower range colors as well. For example if a metric has an acceptible value range, I'd like to shade anything above the upper limit as red and below the lower limit as green to add context. The SPC chart type seems to have the closest functionality to this with the UCL and LCL lines, but they can't be manually set based on business rules instead of standard deviations.
