Learning language platforms

starting to build a language learning app, for the third time. first two times i got somewhere but never finished, i have the code on github to prove it. this time i actually sat and thought before touching anything. today was just database design. one interesting decision was using JSON for the notebook so it can handle any kind of note, from the AI, from a video call, or just manual. nothing running yet. the app will have an AI dictionary sidebar, smart notebook, translation history, and video/voice calls with AI suggestions during the call. would you use something like this?