A bunch of ideas doesn't make a book. Actual writing takes place, the length of each sentence, the specific choice of words, the pace, the choices, the editing. It's literally an art. Nobody wants to read what ChatGPT wrote based on your prompts.

Of course you can use it to quickly try out stuff, for some editorial tasks and such. But unless you learn the craft of writing I don't think others will want to read any of this stuff.