Whats wrong with something like this

  import kotlinx.coroutines.*
  import kotlinx.coroutines.channels.Channel

  fun background(): Channel<String> {
      val ch = Channel<String>()
      GlobalScope.launch {
          delay(5000)
          ch.send("OK")
      }
      return ch
  }

  fun getWebsiteData(url: String): Channel<String> {
      val ch = Channel<String>()
      GlobalScope.launch {
          delay(4000)
          ch.send("website data")
      }
      return ch
  }

  fun work(): Channel<String> {
      val ch = Channel<String>()
      GlobalScope.launch {
          delay(1000)
          ch.send("work result")
      }
      return ch
  }

  fun main() = runBlocking {
      println("START")
      val bck = background()
      val urls = listOf("www.web1.com", "www.web2.com", "www.web3.com", "www.web4.com")
      val chs = urls.map { getWebsiteData(it) }
      generateSequence { work() }.take(4).forEach {
          println("sync job done: " + it.receive())
      }
      chs.forEach {
          println("data fetched done: " + it.receive())
      }
      println("background done:" + bck.receive())
      println("END")
  }