Perhaps the writers for Trek could read some of the books and declare some cannon? It could work.
It's canon, not "cannon".
How would ST screenwriters reading some ST novels make them any better than they are?
Jeri Taylor wrote "Voyager: Mosaic" using her own backstory about Janeway, as created for the show but not yet used. While she was with the series, they did end up putting little details from "Mosaic" into episodes to fill in Janeway's backstory.
Then she did the same for all the other characters with "Pathways". She told the writers they were free to make similar use of that novel, too, but Taylor had already left the show and the screenwriters were developing the characters in ways that did not necessarily agree with "Pathways". But so what? "Mosaic" was better conceived than "Pathways" anyway, but why stymie the screenwriters by forcing them to use "Pathways" in all future episodes about the characters' past lives?
Gene Roddenberry praised "Enterprise: The First Adventure" on its back cover, but it's my
least favourite Vonda McIntyre ST novel, and I much preferred DC Comics' annual, "All Those Years Ago...", as to how Kirk's first mission unfolded. Both stories celebrated 20 years of TOS, and neither of them will necessarily match up with JJ Abrams' upcoming film. But so what?
The novels are read by about 1% of ST's audience.