I looked a little deeper into that variable you posted.
It seems you are using it in the static filter of the admin service desk lists.
I have not found any other variables except for one, OPEN_CLASSES.
I'm trying to do the same thing myself.
What I came up with is creating a view for each Admin Support Group and made a static filter as such:
assigned_group = 'Desktop Apps Support'
(Save this before doing the following as the static filter will not be saved)
Under 'Visible for User Groups' at the top of that window, Select the Admin Group that can view this view.
In my case it would be 'Desktop Apps Support'. Deselect all the other groups.
Now if the admin is not a SysAid administrator, defined under Permissions for that admin at 'SysAid administrator (SysAid Administrators automatically have all the permissions.)',
they should not see or use this custom view.