GSA - Web content filtering - Custom blocked page

Hello everyone, I have a quick question.

I just tested the 'Web Content Filtering' of Global Secure Access. However, in Microsoft's documentation, two processes are mentioned for displaying blocked sites (related to HTTP and HTTPS).

I wanted to know if it is possible to create a custom page (for example, adding the company logo, indicating the reason for blocking such as the associated web category, etc.). I tried to search, but no documentation related to this is available (or at least I couldn't find it).

Thanks in advance for the help!