There are some areas where Apple is prioritizing getting developers on board with their hardware, and the neural engine seems like one of them.
Over the past couple of years, coremltools [1], which is used to convert models from Tensorflow and other frameworks to run on Apple hardware (including the neural engine when available), has gone from a total joke to being quite good.
I had to get a Keras model running on iOS a few months ago, and I was expecting to spend days tracking down obscure errors and writing lots of custom code to get the conversion to work -- but instead it was literally 3 lines of code, and it worked on the first try.