Deterministic way to mark generative answer output as AI-generated - AI Act

Hi all,

We have a text-based RAG agent in Copilot Studio using the Azure AI Search connector as the knowledge source. It's customer-facing.

We need every generated turn to carry a machine-readable marker identifying it as AI-generated, not just a visible disclaimer line. Instructing the model to append something isn't acceptable for us, because it's non-deterministic and can be prompt-injected away.