Thankfully I made good architecture decisions early on and it actually wasn't too hard; it wasn't even originally planned for the game.
I'm not home right now, so I can't remember if your game is made with Unity, but if yes, it's actually relatively easy for a very basic one. I'll have to find a Twitter thread that's a little more advanced and it looks awesome. I'll reply to you in a bit once I find it, and I can show you some of my code for mine. Combined, you could make a pretty easy, snazzy dialogue system.
Thank you for your feedback.