Feature request: custom app password

Can we have the possibility to lock the app with a custom password like other apps, rather than the system passcode ? Because my kids know my iPhone passcode but I don’t want them to enter into my Bear notes.
I lock/encrypt my notes with an specific passcode but this feature is not perfect : it adds a second password, which is not very quick, and search don’t work properly (search don’t find word in those encrypted notes).