At the moment: no. But we want these things!
I have done experiments with adding text overlay to the video, but it requires re-encoding the video in real time which is very resource intensive. It works ok on a high-performance desktop, but is impractical on laptop hardware. So we are looking into alternative methods to export some metadata file (subtitles or something) to overlay on the video in post-processing.
We are working on both of these things when we can. Both will take quite a bit of work, and will come in time.