This is definitely on my mind at the moment since it’s been requested a bunch. No promises but I’m thinking about it.
One workaround in the meantime would be to use the YouTube functionality: Synchronize transcriptions to YouTube videos. You’d need to find or upload a video to YouTube with the audio first. This was implemented a long time ago and is missing niceties like automatic transcribing and synchronizing, and the manual synchronization is a bit time consuming.