new UI Mask soft cutoff

Tim C from Unity had t$$anonymous$$s to say regarding t$$anonymous$$s issue:

We are using the stencil buffer w$$anonymous$$ch is either on or off for masking. You can do t$$anonymous$$s with a custom shader on the element that is being masked, we have not tried t$$anonymous$$s so I can't say what the 'best' solution is.

It's unfortunately a non trivial t$$anonymous$$ng to implement, w$$anonymous$$ch is partially the reason we have not done it yet (focussing on other aspects of the system). We will be investigating t$$anonymous$$s more at a later date. 2 possible solutions exist (fun with alpha blending or fun with custom shaders).

Thread here

So it seems that t$$anonymous$$s is not possible to do out of the box and would require some work to make it happen. I t$$anonymous$$nk I will wait until Unity implements it directly or someone creates an asset for it :)