I need to send the data from a view that returned NULL, but is going as empty. The fields are of type String.

I'm using: 

 SET tSC  = ##Class(%ZEN.Auxiliary.jsonProvider).%WriteJSONStreamFromObject(.tSteamJson,pObj,,,,"e")

{
    "altura": "",
    "atendimento_id": "3060382",
    "data_atualizacao": "2021-12-16 10:39:12.0",
    "data_coleta": "2021-12-16 10:37:00.0",
    "data_liberacao": "2021-12-16 10:39:12.