EXCLUSIVE: Jennifer Garner is in final negotiations to join Fox 2000’s coming-of-age film Simon vs. The Homo Sapiens Agenda based on the popular YA novel by Becky Albertelli. She joins an ever-growing cast on the film which includes Katherine Langford, Nick Robinson, Alexandra Shipp and Logan Miller. Greg Berlanti is directing. Fox acquired the popular YA novel in October for The Fault in Our Stars producers Wyck Godfrey, Marty Bowen and Isaac Klausner at Temple Hill…