timeMode=loop and caption annotations

[azaroth42]

If there's a video or audio playing with timeMode=loop, and the canvas is longer than the timed media, and there are annotations associated with timed parts of the media (such as captions, but could be anything) ... how can the clock reset for the looping media be aligned with the other annotations?

Is this a case where you'd annotate a Canvas with the audio and the other annotations, and then annotate the canvas into the larger one with loop? I believe that would work but would like a second opinion. If not, then is there an existing solution, or do we need more specification machinery?