It doesn't matter which language you are using on your website. The Rank Math plugin is built to help your website rank on Google. But for performing SEO in multiple languages, you must use another plugin to make the website multilingual. For using various language features, the user is required to learn how to translate your WordPress Site using TranslatePress Plugin, which enables optimizing your SEO site in each language.  This TransplantPress automatically connects with Rank Math and enables users to create a multilingual XML sitemap. It helps Google to discover the content language.