[Woocommerce] Product Select2 input field

functions.php

/**
 * Title: [Woocommerce] Product Select2 input field
 * Author: Mattias Ghodsian
 * Description: Let's users search products in wp-admin / Woocommerce Product data
 * Donate a cup of coffee: https://www.buymeacoffee.com/mattiasghodsian
 * Donate Eth: 0xBBB96204E45D11C9799c6B12E6eE6F0d4A071Ef5
 */
 function woocommerce_wp_product_select2( $field ) {
	global $thepostid, $post, $woocommerce;
	$thepostid              = empty( $thepostid ) ? $post->ID : $thepostid;
	$field['class']         = isset( $field['class'] ) ? $field['class'] : 'select short';
	$field['wrapper_class'] = isset( $field['wrapper_class'] ) ? $field['wrapper_class'] : '';
	$field['name']          = isset( $field['name'] ) ? $field['name'] : $field['id'];
	echo '<p class="form-field ' . esc_attr( $field['id'] ) . '_field ' . esc_attr( $field['wrapper_class'] ) . '"><label for="' . esc_attr( $field['id'] ) . '">' . wp_kses_post( $field['label'] ) . '</label><select id="' . esc_attr( $field['id'] ) . '" name="' . esc_attr( $field['name'] ) . '" class="wc-product-search ' . esc_attr( $field['class'] ) . '" multiple="multiple">';
	foreach ( $field['value'][0] as $key => $value ) {
		echo '<option value="'.$value.'" selected="selected">'.wc_get_product( $value )->name.' (#'.$value.')</option>';
	}
  	echo '</select> ';
	if ( ! empty( $field['description'] ) ) {
	    if ( isset( $field['desc_tip'] ) && false !== $field['desc_tip'] ) {
	    	echo '<span class="woocommerce-help-tip" data-tip="' . esc_attr( $field['description'] ) . '"></span>';
	    } else {
	      echo '<span class="description">' . wp_kses_post( $field['description'] ) . '</span>';
	    }
	}
	echo '</p>';
}

How to

$save_data = get_post_meta( $post->ID, 'save_data' );

woocommerce_wp_product_select2([
    'id'      => 'wc_product_ids',
    'label'   => __( 'Products', 'wc' ),
    'class' => '',
    'name' => 'wc_product_ids[]',
    'value'   => $save_data,
    'desc_tip' => true,
	'description' => __( 'Hello world', 'wc' ),
]);