functions.php

<?php
/*
* Snippet: 'Filter' the Dimensions label under the Additional Information tab on the Single Product page in WooCommerce.
* Author: Obi Juan.
* Author URI: https://obijuan.dev.
* License: GPL v2 or later.
*/

add_filter( 'woocommerce_display_product_attributes', 'obi_woocommerce_custom_dimensions_label', 10, 2 );

function obi_woocommerce_custom_dimensions_label( $product_attributes, $product ) {
    
    if ( isset( $product_attributes['dimensions'] ) ) {
		
          $product_attributes['dimensions']['label'] = 'Shipping Dimensions'; //Set your custom label. 
    
    }
    
    return $product_attributes;

}