Force light mode for specific app

I use my phone on dark mode, but there is a specific badly done app that uses black text on dark background when using dark mode. So, I want to use light mode only for that app. How do I do that? I'd like something that isn't an app constantly running in the background, so something like an XPosed module would have the best performance. However, I'm open to non-root solutions, especially for anyone who's reading this question and doesn't have root.