Product creation suggested with metafield

I created a custom metafild in shopify to add a suggested product to the product page.

I have added the code to my product template and I am correctly displaying the suggested product.

I want to add the add to cart button for this suggested product so that the user can add the suggested product to the cart without entering the specific page.

{% if current_variant.available%} {% endif%}

With this code, however, I add the main product (the one on the page) to the cart, not the suggested product.
How can I solve my problem?
Thanks