Chinese developer RavelloH has released a python application that scrapes the game covers on the PlayStation Store, all his write up is in Chinese but it is quite self explanatory and easy to use, here is a link to a sample of it in use:
https://ravelloh.github.io/PSGameSpider/
Here is the application, I am sure it can be modified into English if you need to do so.
https://github.com/RavelloH/PSGameSpider
And a link to the developers blog:
https://ravelloh.github.io/