preview the custome field in the checkout page and invoice page

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hello every body, im a new developer trying to work on my skills with shopify apps, 

i already built a small app that let the customer chose an option from a select dropdown field while making an order in the cart page.

the field is asking the customer "how did you hear about us? " and the options inside that field is coming from the database of the app,

screenshot :


what i want to do is to preview what the customer chose in the invoice of the order



ive tried ,, nothing is working!!!???

so is this possible? and how? 

any help would be apprieciated. 


thank you