Rescheduling coroutines into different worker groups

[DarkDeliver]

Hi Everybody!
Sorry for a dump question. How do i manually specify the worker group where the coroutine should be placed?

class MyCoroutine : public oatpp::async::CoroutineWithResult<MyCoroutine, const oatpp::Object<MessageDto>& /* result type */> {
private:
    oatpp::Object<ProcessedMessageDto> m_dto_to_return = ProcessedMessageDto::createShared();
public:
    Action act() override {
        OATPP_LOGD("MyCoroutine", "entry point")
        return yieldTo(&MyCoroutine::readFileAndGetSize);
    }

    // I/O Operation
    Action readFileAndGetSize() {
        // READ FILE FROM FILESYSTEM AND GET ITS SIZE
        m_dto_to_return->size = MyCustomStaticFileHandler::getFileSize();
        return yieldTo(&MyCoroutine::callulateFibonacciSequence);
    }

    // Data-Processing Opetation
    Action callulateFibonacciSequence() {
        // SOME PROCESSOR-DEPENDENT OPERATION
        m_dto_to_return->fibonacci = MyCustomStaticFibonacciSequencer::getResult();
        return yieldTo(&MyCoroutine::checkResults);
    }

    Action checkResilts() {
        OATPP_LOGD("MyCoroutine", "checked result")
        return _return(m_dto_to_return);
    }
};

This is an approximate example. Of course my service has multiple endpoint's with different logic: retrieving data from multipart requests, accessing database and some iterable operations (O(N)). How can i specify which worker should be loaded by the coroutine?

P.S. i found an issue where this question was partially raised. As i understood, by default an act() coroutine has a IO type. Some coroutines like waitRepeat() processes in timer worker. Is there any ways to define the group more "explicitly"?
Thanks in advance!