Elle here from Shopify.
As the checkout is highly secure; there's no option to add additional sections or customize the checkout at this time.
Would you mind explaining further why you do not wish to add the additional note field to the cart page? I can take your feedback to our developers for consideration.
Looking forward to hearing from you!
Main reason is because I have two buttons on my product page, the Add to cart, and the Shop Now. Shop Now works as a shortcut that takes you directly to the checkout page without reviewing your cart. I want to add the comment field there so everyone can add comments if needed regardless the button they clicked. The comment field is for especial delivery instructions, and/or info that our customers need to provide for a special kind of invoice that includes the customer tax profile.
Is there some kind of workaround for this?