Yes. On the Qlik Sense server beta, you can directly upload a QVF from the Qlik Management Console (QMC). You do not need to perform any specific 'export' you can just upload the QVF.
Note the version numbers will need to match. The current QlikView.Next server beta is 0.95, where as the Qlik Sense Desktop is 0.96 so you cannot reliably upload Qlik Sense Desktop QVF to the QlikView.Next server. Everything will come together with the same version number with the 1.0 release of both products (at that time QlikView.Next server will become Qlik Sense).