If the requirement is to import your 120x2 dimension matrix, you can easily do so using the Import button on the left upper corner of the Neural Net Fitting app after defining your matrix in the base workspace.
However, note that the rows of a matrix are mapped as features, the columns are mapped as obseravtions and you should have atleast 10 obseravtions in you data. If you try to import your data in its current shape, it will give you an error becuase there are only 2 columns.
Considering, the 120 rows in your matrix correspond to observations, you can transpose your matrix and then import it using the tool. Refer the following documentation link to read about the import process: https://www.mathworks.com/help/deeplearning/gs/fit-data-with-a-neural-network.html#UsingTheNeuralNetworkFittingAppExample-1
