Well, you could export/download the question as XML file, insert the polygon definitions right into the XML and then re-import the XML. To my current knowledge, you're the first person in 10 years that had polygon definitions available and was looking for a way to import them into the question. Therefore, I'm afraid, the practical advantage of an import option will not justify the effort to implement such a feature. Should my knowledge be wrong and you need the feature on a regular basis, please let me know.