HSN Codes for reimbursement of Insurance premium

My company has made a contract for hiring services trucks on monthly basis for transportation of materials within Gujarat from one branch of the company to another, A term of the contract is reimbursement of Insurance premia charge for the employees of the contractor directly engaged in providing the services like drivers and cleaners. The contractor is required to provide e-Invoice with HSN code for all the services. What is the HSN code for claiming Insurance premia reimbursement at NIL GST along with the services in the e-Invoice? Same for claiming of Toll charges reimbursement as pure agent. Will be grateful for an early response.