Adding ion parameters using molmod database

GROMACS version:
GROMACS modification: Yes/No
Hiiii, I want to perform simulation of protein using some ions but those ion parameters are not present in that forcefield. Now, I found a database (https://molmod.boltzmann-zuse.de/mollist_ion.php)which provides parameters for different ions and molecules to be used in gromacs. Now, I want to know whether these parameters for ion and molecules can be used with any force field??

and is this correct way to proceed?
Please help !!