It is not possible to use USB as output to DAC. But it is possible to configure 1 of outputs to Digital SPDIF. Then connect the output to digital coax input on your DAC. I tried that with Chord Mojo and it worked. For such good Utopias I would suggest something much better than Mojo, though.
Fanless HdPlex (HQPlayer) -> Merging Hapi -> Genelec 8351B