[keycloak-user] Trying to use offline captcha on forgot password page

Hi, I am new to keycloak. As per one of our requirements we need to have something like offline captcha ( having no internet access) on forgot password page. I am planning to add external jar file for captcha. Is it possible or not ?Is anyone having same kind of thing ? Apart from external jar is there any better way to add captcha without internet ? Thanks, Khyati