How to feed a neuron with a set of data in nftool?

I have been working on ANN modeling for solving microwave problems. I am using the nftool for such purpose. Here in nftool each input neuron accepts single input with a number of samples. How I can enable the input neurons to accept a set of data as a single set of input.

For example,

First data sets are as follows:

Input neuron-1, A1 = [a1 b1 c1]

Input neuron-2,B1 = [d1 e1 f1]

output neuron, Y1 = [x1 y1 z1]

Similarly, second data sets are as follows:

Input neuron-1, A2 = [a2 b2 c2]

Input neuron-2,B2 = [d2 e2 f2]

output neuron, Y2 = [x2 y2 z2]

I would also appreciate some guidance for editing the nftool generated sample code in order to get this task done.

Thanks a lot.