I believe they have already tried using this extension, but without success.
If I understood correctly, you want to add random numbers from 21212 to 21212121 to a list.
Since you’re trying to use this extension, I imagine the elements to add are so many that the UI freezes.
To work around this issue, you could also simply use a Clock.
As the developer pointed out, this extension has much more potential
In any case, here is an example of how to add 100 elements to a list with a delay using a repeating task.
Try showing me an example of these tasks you need to execute, because I’m not fully understanding the requirement.