Update.
chocolate gouramies definitely eat dwarf shrimp.
I've seen them devouring an adult CRS with my own eyes. The CRS had just moulted, so I suspect it was easy prey.
I've also noticed that since removing my chocs from the tank (they are in QT) the shrimp population has exploded, so I summise they were eating a lot of shrimplets (blue pearls).
I would still keep them with shrimp, but only if the colonies are established enough to withstand it.