Set gradient stops for chart data to absolute values rather than percentages
As of March 2020, gradient stops for chart elements are set to percentage of the data range (i think), but it would be more useful to have the option of setting them to specific data values.
Also, marker gradients currently apply to the symbols themselves, which is pretty useless. Instead, marker gradients should reference the data range so the whole marker's color depends on value.
Example: I'm charting blood pressure values. I want the marker and line colors to reflect the normal range (systolic below 120 = green), hypertension stages (above 130 or 140 = yellow–orange), and critical (above 160 = red). Using the current percentage stops I can get it about right by trial and error, but adding data or a different patient requires resetting all the gradient stops. Very inefficient!