What is it you are looking for with the Hierarchy? You can effectively create a project in Atlas/Atlassian Home for anything you like, it can be connected to something in Jira or not, as you wish. When you create a new project, leave the Epic link blank, then once you have the Project created, in the "Where is work tracked" field, you can paste a link to any Jira issue, at any level, it doesn't have to be an Epic and you can sync to that issue.
If you track work somewhere else, you can link to that also.
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