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For anyone interested in the technical details, the setup is a NodeMCU paired with a WS2812 LED strip running WLED software, which receives E1.31 (sACN) data over WiFi, sent by my PC with a custom C# program (what a mouthful). As soon as I get some more work done, I'll make a repository.
The program is not even remotely done. The main idea is that it will tap on LoL live client data to figure out which champion is being played, and then set up keyboard macros, so that when you press R, a certain animation plays. So you could have different animation sets for Vel'Koz, Evelynn or Xerath. Only Vel'Koz for now because Vel'Koz mains.
Some people were right in that the animations don't trigger when an enemy is hit, or accounts for channel interruptions, it's just a timer.
The next step will be integrating it with more stats, such as Health/Mana, to create interesting effects.
EDIT: I'm absolutely going to create a GitHub repo for this so you can contribute with animations for every champ. As soon as I add support for it and document everything up I'll post a follow-up with the repo link.
EDIT2: Check out the repository here! Help is greatly appreciated.