A user account associates a textual user name with a numeric user ID and group ID, a login password, a user's full name,
 a home directory, and a login shell. This data is stored in the /etc/passwd and /etc/shadow files, where it's accessed 
by login utilities as well as by other applications that need user-account information.

If you are creating authentication using jwt like https://appdividend.com/2020/07/09/angular-authentication-system-login
-and-registration-in-angular/ this then you must need to generate a token from serverside and save it to the client-side
 for the future reference.

You should be able to create a User based on the API exposed by qnx system.