When a song is playing, you touch the 3-dots button and go to "lyrics" (attached image), you're redirected to a Google search for the lyrics, so, why not adding a setting to modify where the lyrics will be searched, like DuckDuckGo, Bing, Yandex, lyrics.com or even custom provider?
It's easy specially for lyrics.com since their links are like this: "https://www.lyrics.com/lyrics/[song game, it can have spaces]", for example: https://www.lyrics.com/lyrics/We don't talk anymore