Hello @pradeep verma,
Can you give me a few more details on your use case?
Based on your description I'm not completely sure I understand your use case:
You are generating a Json through Javelin and want to register this file and use it in a generator where this generator will be exposed to users on a self service tile or is it the other way around where you are generating a json using a generator and want this to be sent to your javelin flow on the post publish action?
Thanks,