Hi Afinchy,
You can also try using the Post Process volume to achieve this as well. You can set it up to have different shaped lens flare. You can see how this is done in the Content Examples from Marketplace > Open Map > Post Processing map > example 1.7 Post Processing - Lens Flares.
Here is some documentation on Lens Flares to get the shape and look you would like as well.
If you have any questions let us know!
Tim