How to add custom text field with product for checkout in Woocommerce?

				
						if ( ! function_exists( 'yith_wc_custom_input_text' ) ) {
	
	   /**    
	   * Display input text before add to cart button.    */
	   
	   function yith_wc_custom_input_text() {     
			global $product;      
			$product_id = $product ? $product->get_id() : 0;
			$products_to_show = array( 2874, 28 );
			if ( $product_id && in_array( $product_id, $products_to_show ) ) {
				$label = __( 'Write your comments', 'yith-wc-input-text' );
				printf(   	  '<div class="yith_wc_input_text__wrapper"><label for="yith_wc_input_text">%s</label><input type="text" id="yith_wc_input_text" name="yith_wc_input_text" class="yith_wc_input_text__field" value=""></div>', esc_html( $label ) );     
			}   
		}   
		add_action( 'woocommerce_before_add_to_cart_button', 'yith_wc_custom_input_text' );
	}
	
	if ( ! function_exists( 'yith_wc_add_cart_item_data' ) ) {   
		/**    
		* Add the input text value - item data.
		* @param array   $cart_item_data cart item data.    
		* @param integer $product_id     product id.    
		* @param integer $variation_id   variation id.    
		* @param boolean $quantity       quantity    
		*/
		function yith_wc_add_cart_item_data( $cart_item_data, $product_id, $variation_id, $quantity ) {
			if ( ! empty( $_POST['yith_wc_input_text'] ) ) {
				$cart_item_data['yith_wc_input_text'] = sanitize_text_field( wp_unslash( $_POST['yith_wc_input_text'] ) );     
			}     
			return $cart_item_data;
		}   
		add_filter( 'woocommerce_add_cart_item_data', 'yith_wc_add_cart_item_data', 10, 4 );
	}
	
	if ( ! function_exists( 'yith_wc_get_item_data' ) ) {
		function yith_wc_get_item_data( $cart_data, $cart_item ) {
			if ( ! empty( $cart_item['yith_wc_input_text'] ) ) {
				$cart_data[] = array('name'=> esc_html__( 'Your comments', 'yith-wc-input-text' ), 'display' => $cart_item['yith_wc_input_text'],       );     
			}     
			return $cart_data;
		}   
		add_filter( 'woocommerce_get_item_data', 'yith_wc_get_item_data', 25, 2 );
	}  
	
	if ( ! function_exists( 'yith_wc_order_line_item' ) ) {
		/**    * Add the input text to the order.    */
		
		function yith_wc_order_line_item( $item, $cart_item_key, $values, $order ) {
			foreach ( $item as $cart_item_key => $data ) {
				if ( isset( $data['yith_wc_input_text'] ) ) {
					$item->add_meta_data( 'your_comments', $data['yith_wc_input_text'], true ); 
				}     
			}   
		}   
		add_action( 'woocommerce_checkout_create_order_line_item', 'yith_wc_order_line_item', 10, 4 );
	}
	
	if ( ! function_exists( 'yith_wc_add_inline_styles' ) ) {   
		/**    * Add CSS style    */   
		function yith_wc_add_inline_styles() {     
			$styles = ".yith_wc_input_text__wrapper { display: flex; flex-direction: column; margin: 20px 0px; }.yith_wc_input_text__wrapper .yith_wc_input_text__field{ max-width: 220px; margin-top:8px;}";
			wp_add_inline_style( 'woocommerce-inline', $styles );
		}   
		add_action( 'wp_enqueue_scripts', 'yith_wc_add_inline_styles' ); 
	}