I made an iOS / macOS app with similar functionality, Manabi Reader. It has its own flashcard companion app and also integrates with Anki. https://reader.manab

I made an iOS / macOS app with similar functionality, Manabi Reader. It has its own flashcard companion app and also integrates with Anki. https://reader.manabi.io https://reader.manabi.io Japanese only but I am expanding it to more languages early this year.