How can I set other type of LJ interaction in Gromacs?

GROMACS version: 2022.3
GROMACS modification: Yes/No

Dear all,

I want to perfrom the simulation using a corse-grain PE model (https://doi.org/10.1021/acs.macromol.2c00938). However, in this model, the non-bonded interaction is used by the 9-6 Lennard-Jones potential. How can I set such potential in Gromacs ?

Thanks