How to edit Noto emoij animations?

First thanks for sharing the Noto Emoij animations.

I would like to edit one animation. Which seems to be a challenge, since Lottie animations seems mainly and export format.
How are the animations created and is it possible to share editable files as well?

I tried with the Lottie Importer for After Effects, however that one doesn't support all the gradient information in the lottie file format. I can edit all properties, but I have to change gradients frame by frame.


My end goal is to make the Thinking Face more positive. I'm working on a free feedback tool for education and would like to show this to trigger idea generation. The only [Thinking Face emoij](https://emojipedia.org/thinking-face/) that comes close to positive thinking seems to be the Skype Emoij.


I hope it's possible to get access to some source like format, so I can build the animation based on that.

Hope this is the right place, the [documentation link](https://googlefonts.github.io/noto-emoji-animation/documentation) pointed to the issue tracker.

Thanks in advance for your help.