  Spectroscopic Amplitudes (SA) in the Interacting Boson Fermion Fermion Model
(IBFFM) are necessary for the computation of $0\nu\beta\beta$ decays but also
for cross sections of heavy-ion reactions, in particular, Double Charge
Exchange reactions for the NUMEN collaboration, if one does not want to use the
closure limit. We present for the first time: i) the formalism and operators to
compute in a general case the spectroscopic amplitudes in the scheme IBFFM from
an even-even to odd-odd nuclei, in a way suited to be used in reaction code,
i.e., extracting the contribution of each orbital; 2) the odd-odd nuclei as
described by the old IBFFM are obtained for the first time with the new
implementation of Machine Learning (ML) techniques for fitting the parameters,
getting a more realistic description. The one body transition densities for
$^{116}$Cd $\rightarrow$ $^{116}$In and $^{116}$In $\rightarrow$ $^{116}$Sn are
part of the experimental program of the NUMEN experiment, which aims to find
constraints on Neutrinoless double beta decay matrix elements.
