Use CRUD in Woocommerce loop to get custom meta field
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
$product = $cart_item['data'];
if ( $product->is_type( [ 'variation' ] ) ) {
$product = wc_get_product( $product->get_parent_id() );
}
$custom_meta_product = $product->get_meta( '_custom_meta_product', true );
if ( $custom_meta_product ) {
return true;
}
}