Item Display Image via Web/URL

When assigning an Item Display Image or Thumbnail to the item record in NetSuite, it's possible to associate an image to the item which is hosted on the internet somewhere else by choosing ' - New - ' in the Item Display Image dropdown, and when the File pop-up loads selecting 'Web' in the Attach From field.  This then makes the URL field editable and you can provide a URL to the image.  This image is then used for display throughout NetSuite and the webstore.

I'm trying to set that URL field for multiple items and don't want to have to do it individually.  Is this possible to do via suitescript at all?  If I were to create a txt file of JSON objects representing an item's internal ID and the URL for its image and use a scheduled script to run through the file, would I have access to the necessary fields on the item record to set that URL on the item?