Hi Yulia, pleasure :-).
No, I’m afraid neither of the two features you mention are available yet.
Delete observations has already been requested as a new feature, see here:
Duplicate/copy app has not yet been mentioned, would you like to add it as a new feature request? And maybe you could mention under what circumstances/why you might use or need such a function, and what exactly about the app it would copy, for example all screens, list items, icons/images, settings, save targets etc, or just some of the things? (Assume not any collected data).
Kind regards, Kate