Mark,
The Sync API downloads logs, and places them in a directory. From there they can be used as needed. The Splunk App is a tool that is "unsupported" by us, although it was made available some time ago.
As for a particular tool for Qradar or Sentinel it is unlikely, but Field request can be made through the sales team.
As for JSON there is nothing on the roadmap at this time; again a field request can be made.