How I can make request with condition value > const in Matchmaking?

My c# code:

customQueryData.Add("matchData.match", "{ \"$gt\": 0 }");

 represents as in NoSQL explorer

customQuery: "{ "matchData.match" : "{ \"$gt\": 0 }"}" 

customQueryData.AddJSONStringAsObject("matchData.match", "{ \"$gt\": 3 }");