For android I tend to like Safe Notes. It’s relatively simple, encrypted with either passphrase or biometrics, and stored locally, with a way to back up to a file. Just make sure you memorize/save the passphrase so you don’t lose your entries. It’s android only though, if that matters. I only use it for shorter stuff, so I’m not sure how well it works for longer entries.

A lot of the ways they scrape documents are the same used by accessibility tools, so I’d generally recommend against doing this.