@daffodil/product-composite does not provide its own driver. Instead, it hooks into extension mechanisms exposed by @daffodil/product to extend the @daffodil/product driver via a provided module.
To provide both a composite product fragment and a composite product transformer to the @daffodil/product Magento driver, simply import DaffCompositeProductMagentoDriverModule into the app. Both the composite product Magento GraphQL fragment and the associated transformer are defined by @daffodil/product-composite/driver/magento and are provided to the @daffodil/product Magento driver through the DaffCompositeProductMagentoDriverModule.