I think your add-in is super impressive, tbh. I tried it out and it does load the images into the Kanji pages for me. The auto-gen mnemonic images aren’t quite as effective for me (as memory tools) compared to ones I generate myself. Obviously each individual person is going to know what works best for their brain, so any self-generated mnemonic will be superior.
I have no experience creating chrome add-ins or working with the WK api, but if you have your code on github or would be willing to share, i’d love to use it to learn the API.
not sure how much this user-generated repo has been adopted, but it could be a good location to settle on particular images for your add-in or one like it