Xml export with product sizes

Hi there,
By using hikashop plugin google products, makes export a xml file.
In this xml file does not contain the sizes (Lenght, Width, Height) for each product. ( include only the weight)
How to include in xml file the sizes (Lenght, Width, Height) for each product?
Its a very important characteristics..

thanks

Thanks you.
Please add this feature in next hikashop version! its very important feature!