I've had one challenge that has persisted for a long time now. I simply want to send custom structured data to the call during the assistant-request. Nothing I try works. The agent cannot see any variable data that I send and I am forced to use a tool which is very clunky for structured data that should be consistent throughout the duration of the call. How can i simply send a json object that the agent can actually see and use during the assistant request? (i've tried customData, messages, standalone json objects, etc.). BTW customData was recommended by the ChatGPT VAPI assistant multiple times and it is not supported when it is included in the request. @User @User