Can you use PLEX to stream local media to gen 1 chromecast WITH subtitles?

This is something I’ve been trying to do reliably for years. I can stream anything I want easily with VLC or even just Chrome itself but I can’t get subs to work. I was able to make it work for a long time using a Chrome app called “videostream” but it now no longer works correctly on my system. It’s a bit confusing to...