The template used to upload or update group approvers can be found in the "admin settings" - "users", and click on "+ add" - "Assign approvers" or can be found here.
Currently it is not possible to upload/update group controllers through CSV upload.
The file consists out of four columns:
In this column the email address of the approver can be added
In this column the group name of the group for which an approver should be assigned can be added
In this column the group ID of the group for which an approver should be assigned can be added
This column can be used to establish or brake the link between the group and the approver.
When the relationship needs to be activated: active = 1
When the relationship needs to be de-activated: active = 0