Get the variant id of the featured image product

Hi, i need to get the id of the branding image (like a : {{product.featured_image.variant.id}} or a {{product.featured_image.variant.sku}} ), how can get this informations ?

Thank you in advance !

The product image ID is a property available in Liquid already.

https://help.shopify.com/en/themes/liquid/objects/image#image-id

What are you trying to do that would stop you from accessing that?