ACF-creat.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

add_action('acf/init', 'ofert_acf_add_local_field_groups');

function ofert_acf_add_local_field_groups() {
	
	//$screen = get_current_screen();
	
	$post_id = isset( $_GET['post'] ) && !empty($_GET['post']) ? sanitize_text_field($_GET['post']) : false;
	
	if( !$post_id ) {
		return;
	}
	
	$product = new WC_Product_Variable($post_id);
	$childs = $product->get_children();
	
	foreach ($childs as $child) {
		/*$fields[] = [
			'key' => 'variation_tab_'. $child,
			'label' => get_the_title($child),
			'name' => '',
			'type' => 'tab',
			'placement' => 'left',
			'endpoint' => 0,
			
		];*/
		$fields[] = [
			'key' => 'variation_title_'. $child,
			'label' => 'Title',
			'name' => 'variation_title_'. $child,
			'type' => 'text',
		];
		$fields[] = [
			'key' => 'variation_gallery_'. $child,
			'label' => 'Gallery',
			'name' => 'variation_gallery_'. $child,
			'type' => 'gallery',
		];
	}
	
	acf_add_local_field_group(
		[
			'key' => 'single_product_variations_galleries',
			'title' => 'Variations Galleries',
			'fields' => $fields,
			'location' => [
				[
					[
						'param' => 'post_type',
						'operator' => '==',
						'value' => 'product',
					],
				],
			],
		]
	);
	
}