Add a book source by scanning its ISBN barcode

When I read paper books I capture quotes with the Screvi app, but every new book means typing the title and author by hand or searching for it, and the search often misses editions in other languages. Book-cataloguing apps like My Library let you point the camera at the barcode on the back cover and fill in title, author, cover and page count instantly from the ISBN (free services such as Open Library support this). In Screvi that would make starting a new paper book a two-second step instead of the most tedious part of the workflow. It would also attach the ISBN to the source, which helps match Screvi books with other tools and exports.