Yes, indeed. You can now offer your e-buyers personalizable products (apparel & accessories) by creating a mock-up on the Teezily+ Dashboard. You can then push your personalizable products to your Shopify Store. The Teezily Plus Shopify app makes it easy for you customize your products, and it comes with support for t-shirts, mugs, sherpa blankets and other items.
Please bear in mind that the feature is available for your API Shop and for your Shopify Shop (not for Woocommerce).