+1 I once created a topic related to this which I think you may like in the first link below but considering it was in the Muon version, which is now deprecated, the topic closed. However @TeaxBoox756, I think this is widely wanted and it will be best suited if you were to change the category of this topic to Brave Feature Request Desktop Request
https://community.brave.com/t/enhancing-private-data-security-braves-built-in-about-passwords/9858
This is the closest related issue that is listed in Github - Private wallet data should be encrypted but it doesn’t seem exact of course.