[TaskFlow] running multiple engines on a shared thread

Hi, We are using taskflow to execute workflows. Each workflow is executed by a separate thread (using engine.run() method). This is limiting our capability to execute maximum number of workflows that can run in parallel. It is limited by the number of threads there in the thread pool. Most of the time, the workflow tasks are run by agents which could take some time to complete. Each engine is alive and runs on a dedicated thread. Is there any way to reuse or run multiple engines on one thread. The individual tasks of these engines can run in parallel. I came across iter_run method of the engine class. But not sure if that can be used for this purpose. Any help is highly appreciated.