What option(USE_NNAPI "Use NNAPI") is used for?

Hello all,

there is an option(USE_NNAPI "Use NNAPI" OFF) within CMakeLists.txt#L179
I’d like to know if this option is on, what is in this case enabled?
I do have a device with NN-API driver - is this help to use this device NN-API backend?

Thank you.