With the Vicotee Cloud you can define your own JSON format for collected data that is forwarded to your servers. However, a sensor can collect more than one measurement, and Vicotee Cloud will push one and one measurement to the servers.
Let say you have a sensor collecting four measurements: temperature, humidity, air quality and ambient light. This resulting the Cloud will push four separated message to your servers. If you want to push all four of them in one messages, then you need to disable 'Customize Body' option in the Web Interface.
NOTE: The JSON format for bulk sending the measurements is predefined and you can not modify it.