I don't recall if WC already has a template tag for you to output this but you can do this yourself. So assuming "collecties" is a normal WP page, you can create a file named "page-collecties.php" in your theme folder and this file will be loaded whenever someone visits that page. So in that file, you can first copy the default loop from say the normal page.php file of your theme. Then utilize WP_Query to generate a new terms object of the brands you would like to show. The object will contain all the information you need including title/description/thumbnails...etc.
Again, there may be already functions that do this by WC but I don't remember. I usually build my own custom loops as this gives me full control of the output.