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on a related note - is there something like gltf but for 2d vector animation?

Never heard of it, thank you very much!

While Lottie has existed for a long time, I'd consider looking into Rive instead https://rive.app/

Compared to Lottie, you can make animations for Rive directly in their web editor.

The downside is that you have to create an account to use it.