Hello, we would need to create a new project for Wikibooks similar to All-and-every-Wikisource and All-and-every-Wiktionary.
The intent is to follow the dozens of Wikibooks specific tickets which can currently be found by querying for "Wikibooks": https://phabricator.wikimedia.org/search/query/LfC.6t8mJYsj/#R
Moreover, 13 of them are only French Wikibooks tasks, so we also might create a project "fr-Wikibooks" to split them: https://phabricator.wikimedia.org/search/query/1ROttmy7_BQG/#R
Best regards.