Hi @johndoea
To show the field, you would need to use something like:
<?php
$field_name = get_field('field_name');
if( $field_name ):
echo $field_name;
endif;
As for the position, you would need to locate the correct template in WooCommerce, usually, you then copy this to your theme and amend it OR use a WooCommerce hook to output the field.
Given what you’ve said about product tags, you should read this as it may help with where to place the code
