how to add a new news source

Hi there, Thanks for the great plugin. I want to get content from a news site which I have a licence for. Their system is old and involves a lot of copying and pasting so your plugin is great for automating this for me. The website is not in the list on the plugin and it's also not on the News API list. Is there a way I can add the website I need to the list so I can get content? The website is: https://gna.org.gh/ Many thanks in advance.