Spell Indicators tutorial?

Hello all,
I've been developing my own game (mostly as a learning experiment) and wanted to implement MOBA-style "spell indicators".

I've figured out how to do this with regular raster images, but I wanted something more extensible - something like Werewolf's beautiful Package here: https://assetstore.unity.com/packages/tools/particles-effects/spell-indicators-64748

Things like a variable length arrow, variable diameter circle, etc - it seems like these are vector drawn. Is there a good tutorial that can get me started?

Thanks everyone!