Thanks for your quick reply. I would have thought so too but the mappings it gives are:
Update the v5 application system Parameter No. 8265 – samlRoleMappings. In the example shown below, the first line samlRoleAttribute=memberOf is required. The remaining lines depend on however you wish to configure the assignment of v5 application User Roles when the borrower is registered.
samlRoleAttribute=memberOf
role1=Administrator
role2=Library Staff
ou1=CN=Admins
ou2=CN=Department Staff
In google you can only map it to the basic headings it gives you on the dropdown such as 'First Name' or 'Email Address'