I vibed this app a few weeks ago that lets you share highlighted text with it and it will provide you with an AI explanation of the text and the option to make an Anki flashcard.
I find the instant AI explanation less disruptive to flow than pasting a question into Claude/ChatGPT. I'm currently using it to help me read philosophy books and it's been really helpful.
I did a while back try to make an auto flash card creator that would create flashcards from a large body of text, but the card quality wasn't great and you're skipping an important step for recall of actually selecting the text you want to remember yourself.