Kindle - text to audio at the same spot

It's interesting that one of the features of the new Kindle is that you can switch from reading the book to listening to it at the point where you left off. I'd like that feature on my iPhone. 

My consumption of ebooks and audiobooks has shot up since I got an iPhone, more the audio than the e. But sometimes when I'm listening to a book I want to transfer to reading it, and then back to listening to it. Revolutionary for me.