Parameters for inorganic compounds are not common in biological force fields. If you're really looking to model Co based enzymes or other proteins, a quick search found this 2018 paper:

Development of CHARMM-Compatible Force-Field Parameters for Cobalamin and Related Cofactors from Quantum Mechanical Calculations
Anna Pavlova, Jerry M Parks, James C Gumbart
PMID: 29334459 PMCID: PMC5980237 DOI: 10.1021/acs.jctc.7b01236

Rick Venable
computational chemist