Production Tools » Photoshop Stacker

i have come across the situation multiple times where id like to add content to dynamically created groups. easier to explain with a example:
lets assume a range motif with 3 cars. i am rendering the shadow for each car as a seperate black and white mask.

i can create a group with the shadow applied as the group mask for each car easily with one smart logic layer set to mask mode.
but currently there is no way (at least i'm not aware of one) to place a curve adjustment layer inside each of these groups.

not sure if this is possible since smart logic layer don't have a children hook. it's also not a dealbraker if its to complicated, since its quite a edge case.