Layered file that I can import to and from Photoshop/GIMP?

So I’m working on pixel art files that are rather layout/design focused and as such, am switching between Photoshop and Aseprite frequently to use features that are stronger in one or the other. Is there a file type that both programs support that includes layers and opacity?

I’m not concerned about Photoshop specific features like masks, etc. I just don’t want to have to save each individual layer as a png, then open each png in a doc in the other program and collate them together.