How to use the finviz.helper_functions.scraper_functions.download_chart_image function in finviz

"""

        payload = {
            'ty': chart_type,
            'ta': ta,
            'p': period,
            's': size
        }

        base_url = 'https://finviz.com/chart.ashx?' + urlencode(payload)
        chart_urls = []

        for row in self.data:
            chart_urls.append(base_url + f"&t={row.get('Ticker')}")

        async_connector = Connector(scrape.download_chart_image, chart_urls)
        async_connector.run_connector()