Add a "GPT powered by OpenAI" action before the "Respond on comment" action. (Please make sure that Facebook - User comments on a post or Instagram - User comments on a post trigger is available).
Select the Action Type as Custom and write the Prompt about how you want your response on the comment.
From the custom value picker select the Facebook or Instagram Comment body and Save the action.
Now add the "Respond on comment" action.
In the response field from the custom value picker select the response from the GPT action.
