Hello. For custom llms does anyone know how we can add this messages as seen here https://docs.vapi.ai/tools-calling#example-modification The problem is, I have a function which needs to be called and it can take 20 seconds to run. I would like to inform the user that the request is been processed and to please wait, i.e:

{
            "type": "request-start",
            "content": "Checking the weather forecast. Please wait..."
        },