I love Calibre and spending time curating my collection of eBooks. I make sure that all metadata is correct and that all books have a compelling book cover and blurb that make me want to pick up the book and read it. You can't judge a book by its cover but you'll never read it if it look boring to start with. To that end I have started using AI to write the blurbs and generate the cover art.
I ask ChatGPT "Write a one paragraph blurb for <title> by <author>" and paste the result into the Comments field on the metadata page. Would this be a feature worth automating in Calibre. I am sure that there is a API for these chatbots. It is faster than "Download metadata".
More difficult to automate but what I have been doing is getting AI image generators to create the cover art for me also. I first use ChatGPT to identify and describe an iconic scene from the book. I then paste the result into an AI image generator. I repeat until I find an image that I like then download it, resize, and add title and author, with an appropriate font, before importing it into Calibre.
When I've finished I convert the book to incorporate the new information.
Just thought that I'd suggest this as a new feature.