This is currently not in our near- or midterm plans, as it can be in a very gray area of Amazon's TOS depending on how it is used . It is not allowed to ask for positive reviews.
Additionally, in some countries such as Germany, it is problematic from a law perspective as it is not allowed to email anybody for business reasons without their consent to receive such messages.
We recommend sticking to other methods of obtaining reviews, as listed in this article (click here!).