How to include custom key/value in webhook?

Dear all =)

Does anyone know how to include a custom key/value in a webhook?
E.g.
"ExampleKey": "ExampleValue"
My current webhook json encodes the payload, so the custom key/value would have to be part of the json block.

Hugs,
Sandra =)

Couple questions

Is this a Kibana Alert or Watcher?

What is the source data of the key value pairs?

Is it static or dynamic?

Can you show a sample of your webhook json payload?

You can put anything you like in the payload, but there is only certain data in the context that is available for the action.