The order item meta is shown on the Edit Order page, so it's definitely possible to retrieve these items.
Check out these files:
class-wc-meta-box-order-items.php (lines 23-26, 56-65)
...and that file includes this one:
html-order-item.php (lines 42-67)
There's probably also some code to display these fields in the order email file:
class-wc-emails.php (line 283 function order_meta)
Basically you have to get the order, then get each product in the order, and then pull the meta values for that line item.
If I knew more about how exactly you want to use this data, I could probably give you some custom code to put it where you want.