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No such feature is available from the Adobe Portfolio editing console. Maybe you can find one on a 3rd party site that can be embedded into Portfolio with an <iframe>. See details below. Otherwise, this is not possible.
I have downloaded many 3rd party Countdown modules and tried embedding the iframe code but none have worked, Portfolio didn't like the code of any of them. Tried tweeking the code as well but no luck.
Other things have worked OK.