Modifying repositories inside buildscript via init

Help/Discuss
1

I have a build.gradle with a buildscript

buildscript {
  repositories { jcenter() }
  dependencies {
    classpath 'myPlugin-1:4.0.0'
  }
}

is there a way to modify the repositories list with a local plugin (similar to the EnterpriseRepositoryPlugin example), or add additional URLs, via init.gradle?

For example, to add

repositories {
  maven {
    name "Local mirror"
    url "https://artifactory.myrepo.com/m2"
  }
}

I’m pulling it in the source via a yocto bitbake recipe, and I can add an init.gradle, but I’d like to avoid patching the build.gradle if possible.