Hello @Carthagee and @lucky_geo_mango !
Unreal already has a built-in subtitles feature in the engine.
Personally I have never used it with sequencer but it should work without complications.
I leave you a link on a tutorial made by the community where you can see how the subtitle work:
Now, I found an external plugin to Epic which points exactly to what they are looking for, subtitles directly in the sequencer. I have to make the disclaimer: this plugin is external and Unreal is not responsible for any problem you may have with it.
But you can try if it is what you need.
I would recommend first to try with Unreal’s own system, and if it doesn’t work as expected, try how the plugin works.
I hope this helps you!