No can't be done. Jet A1 has different density from different refineries. The only way to check the delivery SG is to measure it. All the dispensers here have bottles and a little stick that floats in the fuel. The refuellers check the density on request. It is not a constant with temp, but is higher in the winter on average, than in the summer. It will be the same for a few days, and then jump when they change the delivery tank.