The Restart Status report pulls a list of GUIDs and other data. It does this by using the [dbo].[spPMCore_RebootStatusReport7_0] stored procedure. You can use this stored procedure in the filter definition, creating a cloned stored procedure if needed that references more specific information.
Actually, looking at the stored procedure, using one of the views, vPMCore_ComputersPendingRebootByPackage, might be a lot easier.