Optic DOF

Im pretty new to Reshade in regard to actually making my own presets. I want to achieve a slight blur around red dots if at all possible in arma and I've been trying to do so for the past couple days to no success. I've seen some old presets from 2015 that dont work and RealDustFX which is too "brown" for my taste. I would like to see if what im trying to do is even possible and if anyone here could help with that.