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You cannot

The issue with gradleProperty is it provides a values from a root project only https://github.com/gradle/gradle/issues/23572 :-/

That's not "the" issue, it is "one" issue. :-D It also does not provide Gradle properties, but project properties, despite its name. And there is not yet a way to set either of those programmatically. You can just set extra properties which are considered by normal `findProperty`/`getProperty`, but not by those providers.

my solution was this:

val pluginVersion: Property<String> = _project_._objects_._property_(String::class).value(_semanticVersion_(_project_))

then use pluginVersion instead of providers.gradleProperty("pluginVersion") I have a single module project, but I assume its also possible to put that in a script plugin and apply the plugin to all modules.