Hi there! To confirm, are you looking to import the dimensions from Shopify for each of your products, and then have these used for package calculations?

One possible workaround for now you could look into is using the Product Catalogue in Starshipit which lets you upload dimensions against your products which will automatically be used on your orders as you ship. It's a great option and one you could use now. You can check out our guide here: https://support.starshipit.com/hc/en-us/articles/6817931777807-Product-Catalogue and our support team will be able to help you out if you have further questions!