Not yet! We do support Magento2 and Pimcore 4,5 as for now. You can take a look how integrator with Pimcore has been implemented: https://github.com/DivanteLtd/pimcore2vuestorefront
It will give you an idea how the integration with Sylius should work like/ We don't have resources to implement the integration with Sylius yet, so any support will be much appreciated!