How can I address multiple usernames in an email message or alert?

[GW2]

In the ACP>>Communication>>Contact users>>Email users>>User criteria, is there a way to enter multiple usernames in the Username field?

I understand that I can address members that are in the various user groups. However, I do not see a way that I can address (as an example) 10 usernames that might be members of various user groups. i.e.. I do not want to address an entire user group, just a few specific usernames.
How can I address multiple usernames in an email message or alert?

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