You can create an IdentityIQ plugin which can expose additional SCIM objects. For more details on plugin development check this link -
https://community.sailpoint.com/t5/Plugin-Framework/Plugin-Development/ta-p/145288
There is a plugin that exposes IdentityIQ objects are a SCIM extension -
https://community.sailpoint.com/t5/Plugin-Framework/SailPoint-SIEM-Plugin/ta-p/139558