I want a webhook file sync start.

I'd really like to receive file sync start events.

Today webhooks are sent on completion of backend work (ie file delete, file add, etc.) 

But I work with what most of you might think of as huge files.   For instance a 100GB file might take hours, for backend sync, but I'd like notification before it arrives so our other systems can start prepping for the work that is going to start shortly. 

There are lots of other use cases, ie sending early notifications to users who keep asking what's going on, etc. 

Basically a sync-start and some ID and of course a sync-cancel and some ID.... plus the file/folder metadata.