publish numpy matrix to topic

Hello together, I would like to publish a 10x10x10 numpy-Matrix in one publishing step. Therefore I would like to know how I can declare the `numpy.ndarray` as a message type like matrix.msg: > numpy.ndarray matrix Is that even possible? What do I have to add to the `CMakeLists.txt` to get that running? Is there maybe a better way? Thanks in advance!