does the add-on works only for stories or for the tasks as well?
visualized are issues of type Epic and Story. the relation is the custom field "epic_link" as it is used by Jira Agile.
But you can include other issue Typs with a JQL Statement on Manage Maps, example:
project in (Yourprojectkey) and type in ( Story, Epic, Bug, Improvement)
You can easily try your jql in the standard jira issue search area
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