Show Product variant metafield in your product page needs to insert below code in the product.liquid file.
Product file path: Login into Admin panel-> left side menu selects Online store -> select Themes.
Now left sidebar load with file list. Check at Sections bottom of the list “product-template.liquid” file, click on it.
If you did not find “product-template.liquid” then add in this file, Inside Template bottom of the list “product.liquid” file, click on it.
Insert below code where you want to show metafield at this position in the file and save it.
Product file path: Login into Admin panel-> left side menu selects Online store -> select Themes.
Now left sidebar load with file list. Check at Sections bottom of the list “product-template.liquid” file, click on it.
If you did not find “product-template.liquid” then add in this file, Inside Template bottom of the list “product.liquid” file, click on it.
Insert below code where you want to show metafield at this position in the file and save it.
{% include 'all-in-one-metafields', metafields: 'variants' %}
For a quick view of all the above step check the below image
