Woocommerce | Add Product Tab to Products Data Metabox under add new product

woo_add_product_tab_admin.php

<?php 
function add_my_custom_product_data_tab( $product_data_tabs ) {
	$product_data_tabs['my-custom-tab'] = array(
		'label' => __( 'My Custom Tab', 'my_text_domain' ),
		'target' => 'my_custom_product_data',
	);
	return $product_data_tabs;
}
add_filter( 'woocommerce_product_data_tabs', 'add_my_custom_product_data_tab' );

function add_my_custom_product_data_fields() {
	global $woocommerce, $post;
	?>
	<!-- id below must match target registered in above add_my_custom_product_data_tab function -->
	<div id="my_custom_product_data" class="panel woocommerce_options_panel">
		<?php
		woocommerce_wp_checkbox( array( 
			'id'            => '_my_custom_field', 
			'wrapper_class' => 'show_if_simple', 
			'label'         => __( 'My Custom Field Label', 'my_text_domain' ),
			'description'   => __( 'My Custom Field Description', 'my_text_domain' ),
			'default'  		=> '0',
			'desc_tip'    	=> false,
		) );
		?>
	</div>
	<?php
}
add_action( 'woocommerce_product_data_panels', 'add_my_custom_product_data_fields' );
?>