Unable assign predefined Role (User, Service Administrator, etc.) Oracle Planning OCI infrastructure

Summary:

Content (required):

I need to know how I can assign predefined Role (Power User, User, Service Administrator, etc.) to user on Oracle Planning OCI infrastructure. On detail page of user there isn't to able to assign these Role. Thank you

Version (include the version you are using, if applicable):

EPM Oracle Cloud OCI

Code Snippet (add any code snippets that support your topic, if applicable):