Enable report button based on the current user role

Enable report button based on the current user role

Greetings 

i have a report that contains action buttons, i want these buttons to appear as enabled only when the current logged in user has a certain role, for example only CEO role users will be able to use this button.
but when setting the conditions for the buttons' state i can't find a logged in user or a current user field..what i see is Added_user and modified_user fields only, how can i include the current logged in user in the buttons' conditions?

Thanks 

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