@Daniel recently published a great article on animating directly in Hype vs. using Lottie.
Also I think you can use SVGs in the spritesheet feature. I also had some luck in using the great texture packer app to prepare frame animations for spritesheets.
I know this is old.. but I would like to +1 this!
It would just make it easier to integrate some things into angular since there's ngx-lottie and whatnot.. unless, someone has a solution that I'm totally not aware of