How to enable extension's ability to read extension page's data? (Currently "Can't read or change site's data")

I want to allow extension to access extension pages on Chromium (Brave), specifically the Session Buddy page at chrome-extension://edacconmaakjimmfgnblocblbcdcpbko/main.html, so that I can use Imagus to preview remote image URLs without having to open them.

I remember that in the past, it was possible for certain extensions to work on extension pages, such as uBlock being able to block elements on extension pages. Now it seems impossible.

But is there any option in Brave Browser that can allow certain extension to read data on extension page?

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