Is it possible to bulk upload local cover images of books in koha. or any plugins tool available bulk local book cover image upload.

Yes, this is a built-in feature: https://koha-community.org/manual/21.11/en/html/tools.html?highlight=local%2... Scroll down to "To upload a batch of images." -- Owen -- Web Developer Athens County Public Libraries (740) 737-6006 https://www.myacpl.org