Add a "conversational_history" option in openai llm model

Hi,
I use the openai llm model in production, and we would like to incorporate conversational history with the ChatML approach, with the User/Assistant alternating streams that openai supports:
`
[{"role": "user", "content": messge1},{"role": "assistant", "content": messge2},{"role": "user", "content": messge3},{"role": "assistant", "content": messge4},]`

Such that we could provide a list of dicts and update the sent request by appending before the request with the current prompt
https://github.com/explosion/spacy-llm/blob/117f68963870fd2a4af4c706c40cf223c6ae6fde/spacy_llm/models/rest/openai/model.py#L129

So I was wondering if that parameter could be added to the OPENAI rest model