Need to draw box annotation spanning multiple vertically stacked y scales.

[hardik-kapadia]

I have a chart with a dynamic number of y scales all stacked on top of each other. How do I draw a single annotation that spans across all the scales?
i.e. starts at the top of the top-most y scale and ends at the bottom of the bottom-most y scale?

Currently am drawing an annotation for each scale with no yMax and yMin to make sure they cover all scales but then I'm facing an issue with borders. I need only right and left borders on all annotations. I.e. I need to specify different border widths for all 4 borders of an annotation.