WP-CLI

wp wpff list
wp wpff export [<key>...] [--format=json|php] [--file=<file>]
wp wpff import <file>
wp wpff sync [--all]
wp wpff import-acf [--dry-run]

Command	What it does
list	Lists field groups. --format: table, json, csv or yaml.
export	Exports field groups as JSON (ACF's format) or PHP. Without keys, exports all groups. --file writes to a file instead of the output.
import	Imports field groups from a JSON export (WP Freeform Fields or ACF). Existing groups with the same key are updated.
sync	Imports Local JSON files that are newer than the database or not in it yet. --all imports every file.
import-acf	Imports what ACF stored in the database: post types, taxonomies, options pages, then field groups. Keys are kept. --dry-run only lists what would be imported.

See Moving from ACF.