Technique for softness on one edge

Any suggestions for generating softness (similar to the negative softness parameter with cropping that affects all four edges even when only one is cropped) along *one* edge of a clip? The goal is to transition to black along that edge, and preferably via the Edit page.

I can achieve this in Fusion, or on the Color page using a power window positioned across the clip's edge of interest, on a node with a very negative exposure, with the power window's softness widened along one of its edges to form the gradient. But I wondered if there are other less clicks/drags way to get there.

Thanks!

An Edge Wipe with a Boarder and some Feather will do it.