Provisioning API to specify account size

Nextcloud version (eg, 12.0.2): 12.0.2
Operating system and version (eg, Ubuntu 17.04): CentOS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4
PHP version (eg, 7.1): PHP 7

The issue you are facing:
When creating user via Provisioning API there should be a provision to specify the size of the new account created…