Snowballs, ender pearls, eggs, eyes of ender...are all rendered through the SpriteRenderer..you may want to explore a bit that class and also you may find this example very useful: https://github.com/TheGreyGhost/MinecraftByExample/tree/1-16-3-final/src/main/java/minecraftbyexample/mbe81_entity_projectile
Edit: wooops, sorry TheGreyGhost, you were 1 second faster than me
Please do your research on the subject.
You've got the right start. But you've ignore the "Its still a legal grayzone" part. We're trying to work with Mojang to make it legally explicit that we can use it.
But until we get that legal permission we're not going to make it our target.
You can target it yourself for your mod, it's a feature FG supports.
But still, it's not a good option as you don't have the legal rights to redistribute it in your mod code. So be careful.