Feature Request: Dynamic Model Switching and Custom Function Handler

[MMMartt]

I am currently using your latitude-llm, and I find it very useful. However, I have a need to dynamically replace model parameters based on variables (e.g., switching model=gpt-4o to gpt-4o). I believe this logic would be well-suited for integration into the template engine. Additionally, support for syntax like {{if .model | contains "gpt"}} model is gpt model {{end}} would be incredibly helpful. I’d like to ask if there are any plans to support such functionality, as I think it would be a great feature to have.