Zoho Helpcenter - SAML Auth - Map Display Name and Username

Zoho Helpcenter - SAML Auth - Map Display Name and Username

Hello, 
i connected the Helpcenter Authentification with SAML and it works so far. But we want to map The Username and Display Name fields with SAML Attributes so that the Username/Displayname should be retrieve from our IDP when the User is created. But we can't find any documentation about that.
Actually the Display Name and Username are automaticaly generated from the Email Address. 

Thanks   in advance.