The summary of a sub-task is almost always prefixed with the ID of the parent issue, and there's no need to think about "links" as the sub-task always belongs to a parent.
There are some places where it is not, but only when the display is already making it obvious, such as when you are viewing the parent and looking at the "sub tasks in this issue" panel.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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