Log_skip for response status

This is the wrong way to do it. For custom log structure, your module needs to be a log encoder module, not handler.

This works. You just need to adapt it.

example.com {
	log
	respond /400 400
	respond /200 200
	intercept {
		@200 {
			status 200
		}
		handle_response @200 {
			log_skip
		}
	}
}