mr.pngWe have used fiori my inbox to implement approve material reservations, the backend approval is on item level therefore we are only displaying header details in fiori instead of workitems.
AFAIK there is no standard way to display task instance data to pull line-items from the referenced object. MyInbox is a "generic" application that takes data from the task and displays them inline. However, you could create an extension for the application and build your own logic to pull data from the referenced object. Here are some links for you to read about this topic:
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