There is currently no way to do this. However, if you export to BigQuery, you can define an audience here (and ultimately make a list of players in that audience). If you want to target them with a notification, you will need to store on your server a list of GCM tokens (for iOS / Android), and then process the communication with the GCM servers to send push. This is not ideal, but today it is the only solution that I know of.
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