Asyncio, adding tasks to the main loop while running

I have a solver doing some calculations,one takes 5-6 hours. I start it with subprocess.Popen(). I have written a class starting one calculation and managing the solution process (class is operating as long as calculation is in progress). I have 40 cores for the whole problem. I decided not to calculate them in series assigning all 40 cores for each, but asynchronously using AsyncIO, 4 tasks at the time assigning 10 coreas for each. After anyone of these 4 tasks gets solved I want to start another one out of the whole number of tasks, so each moment of time I want 4 tasks being calculated untill all of them done. I have moddeled the situation by a simple code.

Here I have a coroutine doing some work which is aimed to model calculation process. I create event loop assigning only 2 tasks. When both are finished the code finishes. But I want it not to finish but create another task with random (for example) argumen and add it to task list. I am too noobie to understand how...

import asyncio


async def counter(n):
    print(f'counter with argument {n} has been launched')
    for i in range(n):
        for j in range(n):
            for k in range(n):
                pass
    await asyncio.sleep(0)
    print(f'counter with argument {n} has FINISHED')


my_loop = asyncio.get_event_loop()
tasks = [my_loop.create_task(counter(100)), my_loop.create_task(counter(500))]
wait_tasks = asyncio.wait(tasks)
my_loop.run_until_complete(wait_tasks)
my_loop.close()