No, there is no code formatter.
If your question refers the generated C code, you are free to use any formatters suitable for this purpose. However, we consider the generated code as an intermediate format not primarily intended to be read by human. So we do not see any meaningful necessity to reformat the code.
If you refer to the Chora code, then I see it as problematic. First at all you would need to program a formatter, which can understand Chora. Since there is no integration in EmWi for such formatters, you would need to invoke it separately.