Add custom column with metadata on WooCommerce admin orders list

Question

I'm want to add custom column(s) with some meta data on the WooCommerce admin orders list. I found, and modified this for my needs, and put it in my functions.php:

add_filter( 'manage_edit-shop_order_columns', 'MY_COLUMNS_FUNCTION' );
function MY_COLUMNS_FUNCTION( $columns ) {
    $new_columns = ( is_array( $columns ) ) ? $columns : array();
    unset( $new_columns[ 'order_actions' ] );
    
    //edit this for your column(s)
    //all of your columns will be added before the actions column
    $new_columns['dname'] = 'Dogs Name';
    $new_columns['additional_allergies'] = 'Allergies';
    
    //stop editing
    $new_columns[ 'order_actions' ] = $columns[ 'order_actions' ];
    return $new_columns;
}

At checkout I collect these two meta keys:

• dname
• additional_allergies

However, my current code only shows empty columns, any advice to add the meta datea?