Not able to create disulfide bond using -ss command with pdb2gmx

GROMACS version: 2018.1
GROMACS modification: Yes/No
I a trying to create disulfide bond between the two cysteine residues in my protein.
I used the following command:-
gmx pdb2gmx -f wt.pdb -o wt.gro -p -ignh -ss -merge all

This distance between the bonds is 0.202nm.
However, I am not able to see the formation of disulfide bonds in the structure file (wt.gro) as well as the topology file (

The files can be assessed at the following G Drive link:-

I will appreciate any help in this regard.

Thanks in Advance