Provide some sort of real encryption when a note is locked

[Lppsoeht]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
• I optionally donated to support the Fossify mission.

Feature description

Providing some sort of encryption to locked notes by using a master password(or pin/pattern/biometrics if it's possible to generate an immutable password from those).

Why do you want this feature?

Notes app should gain the same privacy and security as writing a file and encrypting it inside a sandbox on desktop.

Additional information

I'm not sure how the notes are organised inside the app's sandbox, they could already be encrypted.
In that case feel free to close the Feature Request.
Instead if they're handled like gallery's locked medias, they're not really encrypted inside the sandbox fs.