Get MetaBoxes from a product or post in jetformbuilder, and use them for a calculated field

A cotinuacion share a small solution that I found apartir of several problems to obtain metacampos of a product woocomcerce or a post, where they managed to get the necessary data but these did not work in the calculated fields, digging a little discovered that did not take them because it did not detect the user insertion event, so I created a code that emulates that event and thus worked correctly