Neither of these have options for a box that’s wider at the top than it is at the bottom. I don’t think even Cuttle does! Though I can’t imagine it would be hard for someone who’s skilled in that to create a template eh @tobyschachman? It’s more of a vase style. Here’s a basic look at what the design would look like, but he generated this by hand…
There’s one here you can download that might get you started!