Are you still looking for solution to this?
The product option name is stored the same way as with regular SKU objects - SKUName.
The mentioned macro expression puts the option name in the next row with indentation. If you wish to put it next to the original item, you would need to either modify the transformation result using some script, or you may need to put the option name information to the parent product row in the Content table, and put the name into custom column.
The principle of this approach can be found in sample custom provider in default installation, typically in c:\Program Files (x86)\Kentico\8.2\CodeSamples\App_Code Samples\E-commerce samples\CustomShoppingCartInfoProvider.cs as last customization named "Example: Adding custom SKU columns to shopping cart content table and displaying them on the invoice"
This way you could check in code whether given product has the option (you would need to go through all the shopping cart items and search for matching parent id and isProductOption flag) and optionally put the option item's SKUName into the custom column into given content table row.
Should you need any additional details, please feel free to ask.