Currently, adding a markup to a Legend removes it from any previous Legends it was associated with. Instead, the menu should have something like checkboxes to select multiple Legends.
I know that this can be implemented, because it is already possible to trick Revu into binding one markup to multiple legends! It's a rather cumbersome workaround that I will not share publicly for fear of the bug being patched (if you are curious, please direct message me!), but it is doable.
This would allow different descriptive tables to be shown at the same time on the same sheet; for example, itemizing a list of power poles while also summarizing them by size and type.
