https://ankiweb.net/shared/info/681236951
I do not have time to support this project, unfortunately. Please feel free to fork and/or upload your own version of this type of add-on.
An addon for Anki Spaced Repetition Software (https://ankisrs.net. Why: https://www.gwern.net/Spaced%20repetition) that embeds an input text area for users while reviewing notecards. This allows the user to type out multi-line guesses within the client.