Set SQL alias value

Question

Is there a way to set value of alias isApprover by checking on another column by or e.g. (if the Control.ApproverID or Process.TApprover has a value then set the alias with true value)

Here are the two columns:

cast(case 
        when max(isnull(Process.TApprover,0)) = :MemberId 
           then 1 
           else 0 
     end as bit) as isApprover,

cast(case 
        when max(isnull(Control.ApproverID,0)) = :MemberId 
           then 1 
           else 0 
     end as bit) as isApprover,