Hi @EliasDaler, yeah one downside is that the current JSON sprite sheet is not well-documented (it’s like a “de-facto standard” for sprite sheets, but I’m not sure what is the origin of the format, maybe TexturePacker).
About the JSON format you propose, I think you will find this script useful: GitHub - dacap/export-aseprite-file: Little Aseprite script to export the data inside a .aseprite (it can be adjusted to export whatever you need to export)