You are asking something that is obviously not programmation related / aka something that an addon author would be able to do - unless you want to hear your books in a bot-voice like Harven suggested but there again third party software is necessary when it comes to 'hearing' the books.
Obviously Zenimax didn't create voice over books - so - your only option here is to find a nice add-on author that reads and registers every book in Tamriel with his own voice and then upload the crap in a giga-sized addon that ESOUI wouldn't allow anyways
Not wanting to sound depressing here tho lol
If Zenimax actually did voice their books over then I guess it *could* have been possible to pop that voice over again when you access a book you found in your library.
The only leftover option is to paste book texts in a text-reader bot
*edit* playing own audio files is not even allowed yet.