In a plugin UI be able to set the font family in a text area. Or as alternative be able to set monospace, serif or sans-serif.
Displaying to the user the pluginData value in a text area and using spaces to line the text up into two columns. With variable width font it is not as easy to see the two columns. With a monospace font it is easier to see.
For example, pluginData is a JSON value. To see that lined up correctly you would use a monospace font.
Coming in a future release. The difficulty here is in ensuring that text stays properly aligned (especially once you get into supporting other languages), so I don’t have a firm release date yet. Coming sooner is text color and font size.