Project.atomicfu extension is not available for build.gradle.kts

[vdshb]

I'm configuring atomic gradle plugin (org.jetbrains.kotlinx:atomicfu-gradle-plugin:0.22.0) in build.gradle.kts as documentation said but I can't add

atomicfu {
    transformJvm = true
}

as Project.atomicfu is unavailable.

Reproducer (see last commit at master-branch):
https://github.com/vdshb/atomic-plugin-reproducer-single-module/tree/master

Probably it's because first part of the documentation describes build.gradle.kts and the second one switches to build.gradle style. In this case it's a documentation issue.