Alterpen allows you to create, update and remove custom metafields to products.
Alterpen eases the process of choosing the products in the store and manage the custom meta fields for each individual product. You can also add multiple custom metafields for each product and display additional information to customers.
Just create the metafield in Alterpen and preview the product with the metafield on your store.
Alterpen generates the liquid code so you just need to paste it in the store liquid and it will follow the store theme style and you don't have to worry about customization.