Amazon Kindle Create to other formats

To publish a book on Amazon, it seems that using its "native" tool Kindle Create would be a good idea. However, once your book is created in this tool, it is rather difficult to share a "soft copy" of this book for reviewers. Fortunately, there is a way to do so (thanks to this post) using two pieces of free software, to be precise, a reader and a plugin. The reader is Calibre while the plugin is KFX Input plugin. Before going to Calibre,  create a .kpf file in Kindle Create using the "Generate" function. After Calibre is installed, simply use "Preference > Plugins" to specify the downloaded plugin zip file. Then you can add your kpf file and then "Convert book." Choose your desired formats, e.g. PDF, DOCX or EPUB. At this point you can also add a cover image which will be the first page of your output.