Is it assumed that we need to write our own templates for language generation?

Hi!

I'm glancing through this project after discovering it via https://medium.com/@tc/yes-we-serialize-as-json-over-the-wire-instead-of-protobuf-s-native-binary-format-ea61498a9b00. The article mentions your java/obj-c/js generated outputs, but I don't see templates for any of that here. Does that mean we write our own Soy templates for each language? Or am I just missing where those are?