Exporting highlights made with Kindle iPad from Kindle personal documents to a TXT document

I’m reading books that I did not purchased from Amazon using the Kindle App for iPad and I want to export the highlights I make of those books to a TXT document (Word, Pages, etc) or to Evernote. The problem is that http://ift.tt/QMa3AX is available for Books category and thus, for Amazon-purchased books only. There are no entries from "Personal Documents".

Is there any way or app to be able to export the highlights I made with the Kindle App for ipad into a TXT document?