Passing values with webhooks?

** Please describe which feature you have a question about? **
Amplify Incoming Webhooks

** Provide additional details**
Is it possible to add data to the JSON payload that gets sent when triggering the webhook and have it available in the build?

My use case is to build a tool to trigger builds with a bit of information that the build needs. Is this possible? How would I access the post body in the build?

Start with the Amplify Incoming Webhooks behavior described in the issue and determine whether custom JSON fields are passed through to the build. Check how the webhook post body is exposed during a build. Done means the supported behavior and access method are clearly established, or the requested capability is scoped for implementation.

Written by the indexing model from the issue text.