Hi niwo ,
I know this thread is somehow related to your question, but it is two years old, and images were added to PO PRO.
Not creating new threads in these cases doesn't help us. It makes our work harder and the Forum harder to read. Please take this into account when creating posts.
The images are read in the PO template, so this is as easy as overriding it. Please read this article.
Best Regards,
José Andrés