KNIME AI Extensions - System / Instruction prompts

I am missing the functionality to define the general Instructions (as they are called in the OpenAI Playground) or System prompt as it is called in the API in the KNIME Agent Prompter. How can I achieve setting the overall behaviour of the LLM, instead of providing the context like "You are a… " in a very detailed way in each prompt? Thanks for the guidance if this is already possible today, if not please consider it as a feature request. Best regards