How to add text field on Shopify cart or checkout

Hello, everyone.

I’m creating an e-commerce using Shopify and it’s working perfectly so far. Here is the preview link:
https://preview.webflow.com/preview/asmana?preview=ab355501c284a29a3cce6a5ea014fe9a

Now I want to include a field on the cart or checkout page and managed to do so on Shopify’s settings as you can see below.

Although, once a embed it to Webflow, the field I created is not displayed. And I’m not sure where exactly that would show up.

Is this the right way of doing that?
The reason for creating this field is asking for specific informations on custom itens, such as engravings on jewels, for example.

Thanks!