Currently the only way to add text to a declarative figure is to use the title for a panel. The ability to plot text on the figure axes to add a caption or other additional information would be beneficial.

This would likely be a new class within the declarative framework and could be written to plot either on the figure or plot axes depending on what you were trying to plot. For example, I could imagine adding in the ability to plot local max/min values on the plot axes and separately wanting to add a caption to the bottom of the image on the figure axes.