I believe it is not enabled in the prebuilt binaries for 1.9 because it was classified as prototype.  Am I understanding correctly that you’re able to build from source and run NNAPI with the full JIT, but doing the same with the lite interpreter build is giving you a runtime error “_nnapi.Compilation cannot be found”?  Is the only difference between the working and non-working configuration setting “BUILD_LITE_INTERPRETER=1”?