Adding another comment in support of this request - this is something I would LOVE to see implemented. I interact with book-specific and non-book-specific prompts very differently - for me I have a distinction between a "reading challenge" and a "reading list." I like tracking which titles in a series/by an author/award lists I've read (and seeing the % read go up over time), but that is different and a more passive experience, as compared with "read a book with this criteria" challenges.

I would love this feature, and especially love if you would consider making challenges sortable when you do this? For example, I have some pretty long book challenges, and I'd love to be able to sort the books added to that challenge to see books with a certain pacing or sort by page level if I want to make progress in the challenge but don't want to sit down with a 600 page book.

This will be amazing for so many of the reading challenges I like to do.

I’d love this for the following challenge in particular due to the inclusion of short stories that may have had a stand-alone format as well as being published within a larger collection or anthology. the important point here is that the challenge attempts to track the individual stories, not the collection/anthology publications as a whole: https://app.thestorygraph.com/reading_challenges/2b4ad49e-668a-4824-bd1e-099d898a36a6

So many reading challenges would benefit from this (like reading the 1001 book to read before you die list), also useful for when you read a longlist/shortlist for a literary prize.