how to export all vtt file with one step?

we have about 200 hundreds audios and videos in a storyline file, now the vtt files can be exproted one by one, it's too slow for us.

we have tried the way by named the .story to .zip and find all vtt files, but using this method, the vtts' name were not the same with in the libiary, the name were no pattern and it's hard to regconized.

Is there any possible to export all vtt files in one step?