How to use an Assistant (created using API) in chat.completion endpoint?

For the Assistant endpoint the documentation talks about creating threads and messages and all. But can I not use an assistant in the chat.completions endpoint just as we work with other GPT models. the reason I’m asking this question is because I’m looking to create an Assistant and then use the “response_format” field under chat.completions to ensure consistent response format but this field I couldn’t find in the API for Assistants. Any help or guidance will be much appreciated.

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