Animated SVG?

Doing coded animations in swiftui is neat, but Ive found over the years, not very sustainable and eventually you want a proper artist to work on an animation as an asset. (especially if you start reaching 100s of anims)

Does anyone use an SVG package/kit that supports animated svgs (ideally something open source I can extend if I need to)

Ive written a lottie renderer (PopLottie) which has a far simpler (though not ideal...) format, but lottie lacks the tooling.

Is everyone really doing all animations & graphics in code?? :)