Newbie need a simple 3d file in glb format of a print

I am trying to add a 3d file to my shopify store.

It accepts GLB file formats and was wondering if someone can help me to set up my 1st template?
This is an example file I would like to create in USDZ format.
The square image attached is the image asset for this page here that the 3d model needs to be based on and it requires a simple 2cm border.
Page for the outcome of the 3D model

Image asset that requires a 2cm border


Thank you in advance for any help or advice.

Page for the model

Example asset

Hi, i have no idea about this, but iam curious. Can you post a example how the result looks like? From some working site?