Kind of... but not really, since hipfire and ADS have the exact same FOV, they should have the same sensitivity. ADS should be 1.00.
All calculations on this site use FOV, camera distance is not taken into account, so if you modify the sensitivity for ADS due to camera distance (ADS just moves the camera, fov is unchanged), then no conversion method is going to replicate that. Since camera distance is not modified for snipers, it would make more sense to convert from hipfire instead, so that snipers aren't getting that sensitivity reduction.