We developed a module that adds various export links to the item detail page.
By installing this module, export links like the following are displayed:

Specifically, it adds export buttons for JSON-LD, text data, citation, and content sharing. The visibility of each can be configured from the following settings screen:

By modifying the Omeka S theme to work with this module’s output, you can achieve buttons and functionality like the following example. (We plan to cover how to modify Omeka S themes in a separate article.)

You can see an installation example at the following page:
https://diyhistory.org/nakamura196/s/main/item/3
While this is a module with limited use cases, we hope it serves as a useful reference for those with similar needs.
For more general-purpose export modules, there are Bulk Export which can export metadata in CSV and JSON formats, Bibliography for citation functionality, and Sharing for content sharing. We plan to cover how to use these in future articles.