So, now that ShapeShift supports Bitcoin Cash (BCH) too, is it possible to exchange BCH to BTC using Coinomi in-app exchange?
I would not recomnend that. Had a bad experience on exchanging doge to bitcoin. Maybe a bug, but if not, then exchange fees are very high or exchange rates are unplenty.
But to answer your question: Yes, it is possible to exchange BCH to BTC on coinomi.