The SOH relates the current capacity in kWh to the nominal capacity (30 kWh in this case). So 102% is (30x102/100) = 30.6 kWh. 110% is 33 kWh.
You can't actually read the SOH above 100% using SoulSpy, as the data is not available at the OBD connector - it just states 100%. KIA may be able to read over 100% with their diagnostic equipment. It is possible to keep records of mileage, %age charge and miles/kWh displayed. The data is not sufficiently granular for spot calculations, but averaged over (say) five sets of records, probably reasonably accurate.