How to find Plugin source Jar file

I am trying to find the source file for scala plugin.
My impression was is a gradle maven central where we can find plugin jar(s).
For example, com.github.spacialcircumstances.gradle-cucumber-reporting is located at .
However, I am not able to find any compatible source Jar file for scala plugin.
It is also hard to locate scala plugin on Gradle Plugin Portal (
Anyone has any suggestions/pointer. Thanks!

The scala plugin is built into Gradle.

Hmm interesting. We are actually building a project for customers who may or may not have access to the internet. Gradle also builds and is packaged offline. We are still seeing errors about scala plugin dependency not being found.

However, this gives me a pointer to move forward.

Thanks for the response @Chris_Dore !