Several values in same Webhook


I wonder if it is possible to send several values within same webhook?

In documentation there is a example of Librato webhook

There is part where value is send

“name”: “{{SPARK_EVENT_NAME}}”,
“value”: “{{SPARK_EVENT_VALUE}}”,
“source”: “{{SPARK_CORE_ID}}”

Is it possible to send two values and if so, how can i do that?