Not sure what you are referring to.
a field is a post type. Most of the settings for the field are stored in post_content. Some field settings are stored in post meta.
For the actual field, there is one entry that is "_{$feild['name']}" that contains the field key of the field that is associated with $field['name'] and this is where you will find the content for the field.
Unless we’re talking about guberbuggutenberg. In this case I believe that all of the content is actually stored in post_content for the post.
