Epoxide group in OPLS-AA gromacs file

GROMACS version: 2020.2
GROMACS modification: No
I have a problem. I can’t find parameters for the epoxide group in opls-aa force field files in gromacs files. I want to find all parameters for violaxanthin. Violaxanthin - Wikipedia Do these parameters exist or maybe I have to parameterize this molecule by myself? (It would take probably a lot of time) Or maybe I should use a topology generator or use parameters from different force fields? I will be grateful for any advice