How can I add a text box to a specific product variant?

Store Design
1

Hello everyone,

I have done a lot of testing but can’t do what I want. All apps offer this paid option so I need to do it by code. I would like to add a text box on one variant only. For the moment, I have that :

Anyone have any idea how I can do this?

Link of my shop : https://v4gej6xyeggxy72u-47455862950.shopifypreview.com

Thank you in advance !

2

Please everyone .. There isn’t a Shopify Expert or Shopify Partner here? Or has no one had the same problem before?

3

It’s really crazy…