Hello @RKJ
As of right now there is no other way of deleting local data in the capture app other than manually through the settings menu.
I have asked and there is also nothing planned in the near future in the road map. So, if it is something you believe would be really important for your implementation you can open an issue to request it through Jira so that it can be evaluated.
Let us know if there is anything else we can help you with! 
Regards,
Xavi