How to use external plugin in custom gradle plugin

Question

I'm trying to write custom gradle plugin (for my self) that is using many external plugins like (detekt)... But it seems that this is not possible, I can write only internal tasks that are created by my plugin... It looks like that I have to build external plugin my self and use it as a jar file or to create task that is using for example detekt core API - and this is something I don't want to do...

How can I apply for example detekt library and task configuration to my custom plugin?

package com.urosjarc.gradle.tdd

import org.gradle.api.Plugin
import org.gradle.api.Project
import org.gradle.kotlin.dsl.apply
import org.gradle.kotlin.dsl.existing
import org.gradle.testing.jacoco.plugins.JacocoPlugin

class TddPlugin : Plugin<Project> {
    override fun apply(target: Project) { with(target){

        plugins.run {
            apply(JacocoPlugin::class)
            apply("io.gitlab.arturbosch.detekt")
        }

        task("hello").doLast {
            println("Hello World from plugins! :D")
        }

        val detekt by tasks.existing(Detekt::class) {
            reports {
                html.destination = "$buildDir/detekt"
                xml.enabled = false
            }
        }
    }}
}