A similar question was asked before , but decor does not have cloze or image occlusion flashcard creation ability, on the fly.
In MarginNote 3, An user can crop out a section of document by selecting and apply image occlusion and export it as .apkg.
I believe this the best way to create IO cards quickly.
The closest software was an anki add-on, but it's not as robust as margin note 3.
I also tried requesting margin note dev. to support windows OS, they gave discount coupon to buy marginnote 3 for mac, without responding to the actual question, and subsequent contact attempts didn't help as, they didn't reply.
IS there is a way to run margin note 3 on windows/ubuntu without having to use an emulator.
Or if there an alternative app, which is as robust as margin note 3,
please let me know