Allow in Line charts (or scatter plots) a way to color areas between lines. Color should be based on some logic.
Simple example with 2 lines: Line A, Line B.
In case of Line A above Line B, color the area between those two green. In case Line B is above Line A, color the area between the lines as red.
In case of multiple lines in the chart - provide coloring always based on any combination of the line order.
Here is a similar request on the community:
https://community.tibco.com/questions/what-best-way-do#node-681071