Easy Keyword Sitemap does not create an XML output. It is a content plugin that creates semantic sitemaps within content articles. So, it does not have own templates, it just adds content to existing articles.
The way how the plugin works, it wouldn't make much sense to create XML sitemaps for Google. EKS creates semantic sitemaps, this means that the same article can be listed under several categories if the content matches semantically, so you would have the same link several times in the sitemap.
Actually, you don't need to submit the semantic sitemap to Google, once the Google crawler visited the article with the sitemap, all articles will be visited and indexed anyway!