AWS Certificate Manager (ACM) Private Certificate Authority (CA) now supports additional templates that allow CA administrators and PKI operators a way to control and specify X.509 certificate extensions for the certificates they issue with ACM Private CA. 

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/aws-certificate-manager-private-certificate-authority-now-includes-9-new-certificate-templates/