As @ClockworkOcean said, Bloom is the option you’re looking for. If you’re using one of the recent versions of Unreal, changing the bloom method to Convolution will get you those star looking glow. (but it’s a bit more expensive than the standard method.)
You’ll have to try and profile it to check the performance, it depends on the complexity of your scene
If you need a cheaper alternative you could fake it with textures, have a look at this link GTA V - Underestimated Glow