I came across this today while looking for other books.
Transformers The Movie Coloring Book: (1986 Classic Animated Movie)
Paperback – June 22, 2018

Transformers The Movie Coloring Book contains 68 detailed coloring pages from popular animated movie Transformers The Movie.

Each image is printed on a separate page to prevent bleed-through.

Paperback: 138 pages
ISBN-10: 1721749934
ISBN-13: 978-1721749935
Product Dimensions: 8.5 x 0.3 x 11 inches
It appears to be a self-published book (publisher is CreateSpace Independent Publishing Platform) and it doesn't appear to note in any way that it's an officially licensed product.

The images look like some screen captures through a couple of Photoshop filters. That the images on the cover and the sample pages are the same is not very encouraging. (The Copyright material text on those images is from the Amazon look inside product.)

I was tempted to buy it just to see though.

Images below, and the Amazon listing here.