It seems you are asking them for the top 3/5 in a niche category? It’s not clear to me if you ask for books in the category or in general for 2023 or both. For example I saw one author giving a list of the top books on Leonardo da Vinci in 2023. This would make aggregation of limited value, and the first thing I am presented with is a list of books which have reached some kind of consensus amongst authors, but the lack of consensus was quite surprising before I found out how it worked!
I think there is a lot of value in getting an author's consensus of best reads, and then maybe secondarily including books from a niche interest. This would be a value-add for the author too, since there is more diversity of books.
Nice project, I wish you the best of luck with it.