Could someone explain how this is implemented? I saw on Meta's Llama page that the model has intrinsic support for structured output. My 30k ft mental model of

Could someone explain how this is implemented? I saw on Meta's Llama page that the model has intrinsic support for structured output. My 30k ft mental model of LLM is as a text completer, so it's not clear to me how this is accomplished. Are llama.cpp and ollama leveraging llama's intrinsic structured output capability, or is this something else bolted ex-post on the output? (And if the former, how is the capability guaranteed across other models?)