Will meat cook inside of a rice cooker?
Anything will cook in a rice cooker, eventually. You will need to experiment with the size of the meat chunks.  When the meal is done cooking, take them out and see if they are cooked and at the correct temperature. If not, finish cooking them and cut them up smaller next time.

What I would do however is cube the meat, sear it, and then throw it in to the cooker. You will end up with a better texture this way.