Cycles custom bokeh (non-uniform bokeh distributions and custom images)

LuxCore in the latest version has implemented an awesome feature to have non uniform bokeh and can also use textures: luxcorerender.org/new-features-in-v2-5/ . It is possible to have this in Cycles?

A similar proposal was already done here: blender.community/c/rightclickselect/SYgbbc and someone wrote that a patch to use custom images was made but never went to master ( developer.blender.org/D1691 )

I followed this tutorial youtube.com/watch but it darkens the scene, affects the alpha channel and is tricky to find a proper setting, having a built-in option like LuxCore and Vray would be much better.

thumbnail photo by Ugur Akdemir via Unsplash