Not Canon (imo)
The series finale ended the episode be revealing it was a Tales From the Crypt style show, except spread across a season rather than a single episode.
shareNah, that was more a joke on old sitcoms, when did they did clip shows. "Oh, I didn't see you there!" No Tales from the Crypt intentions.
This series is as canon as can be, it's a direct continuation of Cult of Chucky by the man who created the series/character and wrote all 7 films.