The `export_item` method in `JsonItemExporter` is a function that is responsible for exporting/scraping an item to the JSON file format. It takes an item as a parameter and converts it into a JSON-compatible format. The method writes the converted item to the output file in JSON format, ensuring that the item fields are correctly nested and serialized. This method is typically called internally by the `export_items` method of the `JsonItemExporter` class to export all items in a batch.
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