The convert service helps with the batch processing of files to and from USD. It uses the omni.kit.asset.conversion extension underneath the hood.
The API spec can be consulted by enabling the omni.services.convert.asset extension and browsing to http://localhost:8011/docs
Once up and running it can be used from any process inside and outside of Kit via the service API.
It supports writing the converted file to local disk as well as Nucleus.
For batch processing, this service is integrated into Omniverse Farm as a farm job.