It is currently not possible.

It's theoretically possible, but it would be an incredible burden to maintain and make polished.  Lottie doesn't quite have a spec and often introduces breaking changes.  The Lottie format came from reverse-engineering the After Effects file format.

Our exporter is built by reverse-engineering Lottie's undocumented format and transpiling Animator Core's code format to Lottie's JSON.

So in short, we've filed this as a possible future feature — one which would unlock proper After Effects importing! — but it's not currently near the top of our backlog.

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