Chromecast and external DAC

I’m trying to set up a budget system to stream Tidal and Chromecast Audio caught my attention. I have a Schiit Multibit on the way and was wondering if anyone uses Chromecast Audio as the streaming source and if so, have you tried using an external DAC with it. It apparently has optical and a micro USB ports and I would be interested in using the USB port on the Modi.
Anyone tried such a set up? How’s the sound quality?
Thanks in advance.