Hey, @TBizOps👋 I'm with you, I cannot find this listed in any public document. The knowledge base article for Webhooks in Workflows doesn't list this information. Was your source on this being listed publicly from Support? If so, I'd reopen your ticket by replying to it and asking for a link to the dev doc or knowledge base article.
We'll leave this open in case anyone from our community has a suggestion for you.