The YML files control how the site in question (be it Genius, MusixMatch, etc) is accessed through a direct URL, what is pulled down once it's accessed, and how it's formatted.
Again, the plugin is not built for an intermediate step in between, so what you're looking to do is, therefore, not possible with the plugin. It cannot add steps in between, follow links, etc. It's just not what it does.
Tag your files accurately to use the plugin. A file tagged as Artist:Ariana Grande / Title: Greedy will retrieve the exact correct lyrics from the site.