Thanks for getting in touch! Unfortunately the webhook payloads sent by our subscriptions feature is not customizable at this stage. If you’re wanting notifications sent as part of your deployment, there are some community-written step templates available in our library that you can add to your deployment process. There are some specifically for Slack, Microsoft Teams, Amazon Chime, and a few others, which might offer the level of customizability you’re needing?
I hope that helps, and don’t hesitate to reach out with any further questions!