I have an idea: could a timer be displayed when using an overlay to show how much time is remaining if it's an animation or video file?

For example, I have a transparent background with a video file that includes audio. I’d like to see how much time is left for the video to finish playing, without having to use the preview window. I hope that makes sense. Essentially, when an overlay is selected, a timer would appear to indicate how long it has left before ending.