All available ACF relational fields are automatically detected by WP All Export and added to the ACF section in Available Data.
The following ACF relational fields are available for export: Link, Post Object, Page Link, Relationship, and User. Here's more on each field:
Link: This field allows to select or define a link (URL, title, target) via the WordPress link popup. Exports the link data separated in the fields Link_title, Link_url, and Link_target (if defined). Post Object: This field enables a drop-down list to select posts, pages, or custom post types. Exports the slug of the selected item.Page Link: Similar to the Post Object field, but also allows selecting archive pages. Exports the full URL to the selected item.Relationship: This field stores relationships between posts, pages, or custom post types. Exports the name of the selected items. User: This field allows the selection of a user account. Exports the email address associated with the selected user.
Multiples values exported within the same field are separated by a pipe ( | ) character.