Hide or Password Protect words and sections in documents

I think it would be nice if we could hide or password protect some parts of a document.

When writing documentation there could be some sensitive information that should not be visible without clicking on the "eye" icon like in a password manager or hover over the text. I don't know if there is any need for it to be password protected, but at least have it to be hidden, so when you open some guides or something you don't expose the "sensitive" fields right away.

This could be useful when browsing a document in public or sharing it via screenshare in a meeting etc. Then some fields should stay hidden unless you hover/click on it to reveal it.