Woocommerce Add Product Variation as a Custom Field

Question

I would want to add to my Plugin in the Woocommerce Product Page a Custom Field in the General Tab to add a new Product Variation( just Name, Price and short Description), I haven't found an answer on Stackoverflow, just how to create it programmaticaly, but whithout custom field. Create programmatically a WooCommerce product variation with new attribute values . Would appreciate every help for an answer! Best regards