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From: Richard Stallman <rms@gnu.org>
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Subject: Re: how-many/count-matches for non-interactive use
Date: Fri, 15 Oct 2004 08:22:54 -0400
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    (defun how-many (regexp &optional rstart rend)
      "..."
      (interactive
       (keep-lines-read-args "How many matches for (regexp): "))

    How do I use "p" here?

Since it is using Lisp code, you just do it with more Lisp code.  Add
a t to the list in a place that corresponds to where the new extra arg
gets its value.