Hey Xabyn, thanks for the feedback!
So CC2D wasn't really made for creating animations on other tools. It was more aimed for people with no artistic skill, so they can create and use the resulting characters for their game. Think of it like the character generator within RPG Maker.
It was originally made as Unity plugin, because that is the tool that we use and that we are most familiar with. Only later, due to popular request, we bring it as standalone version, where user can export the characters and animations as png sequences.
That said, exporting to Atlas is currently in the work, and it will be coming on the next update. But it will be just a simple atlas with all the body parts separated. No JSON accompanying them, and it will be up to the user if they want to bring it to other animation software.
Generating a ready to use file for other animation software, won't be coming any time soon, unfortunately. As it is not the main purpose and focus of CC2D right now.
PS.
Thanks for mentioning SpriteUV2, never heard of it before!