PlayStream Segments are based on elements of the player profiles in PlayFab - so, statistics, activity, purchases, time since last login, etc. To use data from an external system, you would have to first ingest that into PlayFab in a way that could be used for segmentation in the profile. Unfortunately, since what you're talking about is an arbitrary ID, you can't just say "is less than X", for example, What you would need to do is use a Tag to identify each player in your list, and then segment on that Tag.
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