Access the cost per item field through the API

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I want to be able to access the 'cost per item' field associated with variants which is visible and editable through the Shopify GUI. I am using the Admin API which does not seem able to receive that particular field. I can receive all the other details of that product/variant. I would ultimately want to be able to update prices and cost using the API. In reviewing the documentation sample responses I do not see this field. Is it possible to receive this information through an API call?