Adding, running test cases are not the only activities a test team needs, easy exploration of stories, test plans, executions are often required.
The issue explorer is using the issue linking feature of Jira to indicate relationship between story/requirements and test plans or from a plan to its executions.
Most links are created automatically during scheduling of executions the only missing link is story to test plan or epic to test plan. As soon as a Jira issue is being linked to a test plan using "Is verified by" link the report should provide a comprehensive view over tests linked and their progress.
Quick reference of the links used:
Story "is verified by" test plan which has "subtasks" - test cases which are "related" to executions.