Is there a way to add custom property to a server and filter by it on client?

Hello.
I want to add custom property to a server(selected map, for example) and filter list of servers by this property on client.
How can i do that?
I'm trying to manually filter by matchAttributes property of MatchInfoSnapshot object(that is returned as a parameter of ListMatches callback), but i don't now how to set this property on server.
I'm using this asset https://www.assetstore.unity3d.com/en/#!/content/41836 as base.
Thank you.

 

did you find any solution ?