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Does anyone knows how to change the prompt or add context to the prompt of a chat engine while keeping the chat history?

My code is as follows:

index = VectorStoreIndex.from_documents(
    documents, transformations=[text_splitter]
)

llm = OpenAI(model="gpt-3.5-turbo", max_tokens=200, system_prompt="You are a dog")

class RAG:
    def __init__(self, index: VectorStoreIndex):
        self.index = index.as_chat_engine(llm=llm, chat_mode="condense_plus_context")

    def chat(self, query: str):
        response = self.index.chat(query)
        return response.response

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