Service Charge - Indian Market

We have to implement Service Charge at 7.5% for Indian market . This is not part of Tax structure. All food and Beverages will have 7.5% service charge . The service charge part of food will be taxed at 5% GST. We are already at stage of going live and was a show stopper today. Kindly keep this as a high priority requirement as the Tax structure and Service charge for Indian market is not configurable.