I need to isolate filters on some objects in the compositor and Blender 2.8 does not have the options to setup object/material passes in the View Layers. Is there anyway to achieve this in Blender 2.8 and for EEVEE?
In 2.8, Cycles there is something called the cryptomatte node. Unfortunately, at the time of writing this, it is not implemented for Eevee.
I found a solution by creating view layers, then evaluating the depth in both. View layers are like 2.79's render layers, so you can exclude objects from being rendered in each.
Next, I evaluated depth in both view layers. Since one of the view layers is missing the object, you can use a greater than or lesser node to create a mask.
Here's a video on view layers: https://youtu.be/BBuD64KhxeY?t=1502
I imagine 2.8 Eevee will gain cryptomatte in the future.