I think that the best way to automate issue creation is using plugin Issue Templates. It's very easy to configure and use. You need to just create template for issue and then anytime you want to create new issue you just need to choose your template and all selected fields will be autocompleted by value from template issue. So you have full control on issue creation. There is also post function to create subtasks on transition (so you can create 5 subtask for epic on issue create) and much more features that make issue creation easier and faster.
Here you documentation.
I hope i've helped you.
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