Need to Collect SKU at Checkout

[kamillerdesigns]

Working on setting up some JS that needs to collect certain data at checkout. 

Those being email, invoice and SKU

So far I am able to collect email and invoice just fine but nothing is working out for SKU. Looking for suggestions. 

[Propero · Accepted solution]

@kamillerdesigns 

Checkout object can access line_items first so something like {{ checkout.line_items[0].sku }} may work.