Sending the post ID via an HTTP request in the Body field

I'm setting up automation for comments under the store's Instagram posts or Reels. Often, customers who shop via Instagram ask for product prices in the comments under posts. I set it up so that the AI agent sees this request, understands which post the product question was under—for example, “Price?” A common response is “I replied in Direct,” but the agent in Direct doesn’t know which post the comment was under, since the system files don’t provide a way to pass the post ID or even its URL. Please suggest a solution to this problem or add the necessary system files to pass this information to the agent in n8n.