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I cannot use

afterEvaluate

I think you are facing an order problem. Consider this

// plugin.kt

    class MyPlugin {
(2)   fun apply() { ... }
    }

and then…

// build.gradle.kts

    plugin {
(1)  id("my-plugin")
    }

    myPlugin {
(3)  myProperty.set(...)
    }

(4) ... // other code

    tasks.register("aTask") { 
(5)   ... // lazy task configuration
    }

The order of execution is 1,2,3,4 & 5. All run in the configuration phase except 5 which runs in execution phase (if set up properly). However, “configuration phase” to your plugin is execution number (2). Theres no way code that runs in 2 will “know about” what happens in 3 & 4 later. Now you can set up your value source using lazy properties so that in (2) you have

val myPluginExt = ...
val myValueSource = providers.value(MyValueSource::class) {
  myValueProperty.set(muPluginExt.myProperty)
}

but if you try to resolve this value source in this same step 2, then it will be the default/empty since 3 & 4 have not run yet. So your options are to delay the resolution of the value source to the execution phase (within some task) or use afterEvaluate.

exactly, that is the problem

plugins {
    id("some.plugin")
}

somePlugin {
    someProp.set("v")
}

println(project.version) // this is happening before reading the the someProp