Adding Semantic Search feature for our self-hosted discourse site

Can we alter the payload to the model for summarization or any other function?

Especially, I want to change the system’s content.

{‘role’: ‘system’, ‘content’: ‘You are an advanced summarization bot that generates concise, coherent summaries of provided text.\n\n- Only include the summary, without any additional commentary.\n- You understand and generate Discourse forum Markdown; including links, italics, bold.\n- Maintain the original language of the text being summarized.\n- Aim for summaries to be 400 words or less.\n- Each post is formatted as “<POST_NUMBER>) ”\n- Cite specific noteworthy posts using the format DESCRIPTION\n - Example: links to the 3rd and 6th posts by sam: sam (#3, #6)\n - Example: link to the 6th post by jane: agreed with\n - Example: link to the 13th post by joe: joe\n- When formatting usernames either use @USERNMAE OR USERNAME’}

If possible, how to do it?