I have several charts for which I need both subtitles and footnotes clarify the presentation of data (and I always use credits). When displaying on the web it is easy enough to add a paragraph under the chart, however I also need this footnote when exporting the chart. I would envision a simple text box above the credits section. Would you consider reopening this request?

Also, the solution in your jsfiddle link pushes the chart down below the footnote--flattening it out completely.