如何在gradle插件中定义自己的配置？

project.extensions.create('myConfig', MyConfigExtension)

class MyConfigExtension {
    String myProperty = 'defaultValue'
}

class MyTask extends DefaultTask {
    @TaskAction
    void myTaskAction() {
        MyConfigExtension config = project.extensions.getByType(MyConfigExtension)
        println "My property value: ${config.myProperty}"
    }
}

myConfig {
    myProperty = 'customValue'
}