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Yes, this is correct, the hierarchy is Epic -> Story (or task, or any other name you want) -> Sub-task.
Sub-tasks of sub-tasks is an anti-pattern, it just makes a completely unusable mess in most cases. The best case is that it drags you into massive micro-management, which is completely unproduvtive.
You should be looking at your processes, trying to make them into a function shape that uses Epic -> Story -> Sub-task as intended. And probably look upwards above epic.
That is not standard Agile practice and is not allowed in Jira.