FEATURE REQUEST/ENHANCEMENT: Group Dynamic Query Custom Property Variable

When defining what objects to place in a group using a dynamic query that calls a custom property, it would be great if it could use the returned value of a variable.

For example, I wanted to create a group for all nodes polled by each poller, so i set up a custom property and used ${EngineID} to return '1' or '2' (or '3', or 'n' based on how many pollers are set up in the environment).  When I go to build the dynamic variable it only takes the exact entry from the database ${EngineID} and not the returned values.