Setup custom SMS/HTTP provider per Terraform

It is possible to configure SMS/EMAIL provider via admin API. https://zitadel.com/docs/guides/manage/customize/notification-providers
But how to configure it per Terraform?
I would like to avoid having some configuration in terraform and some configuration in proprietary scripts for configuring.

ZITADEL can send messages to users via different notification providers, such as SMS, SMTP, or Webhook (HTTP Provider).