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Hi @Vishal Sitpura -- Welcome to the Atlassian Community!
I suspect the answer is, "no".
The Story create would need the issue key from the created Epic, and the Epic has not been created at the time you submit the JSON. And without knowing the internals of how Jira is processing the JSON we may not be able to assume this is iterating and processing those nodes in the order you show them.
Not that I am aware of: the key is generated when the issue is created.