One-time tasks at varying times with Uwsgi Spooler

I'm using django-uwsgi in my application, but I'm needing to run asynchronous tasks (one-time only) in my django app at varying times, based on user input.

I tried passing in at "at" key to a_long_task.spool({'hello':'world', 'at':timedelta(hours=5)), but that raises a

ValueErrror: spooler callable dictionary must contains only bytes

So I guess that means I can only decorate the task instead of its instantiation. Is there some other suggestion to enable me pass in a variable time param when the spooled tasked should run?

TIA!

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