org-capture pass argument to template

Question

I would like to write a function that scrapes the current buffer for any comments with the word "TODO" and runs org-capture, saving a link to that TODO comment in a file. The end goal would be sort of a one-stop location for TODO items like some modern IDEs have:

Ideally, I want the link to show the text of the todo comment. So the following buffer:

int main(/* TODO argc, argv */) {
    // TODO Implement me
}

Would produce the following links in my org file (or something similar):

* TODO main.cpp:1: "argc, argv"
* TODO main.cpp:2: "Implement me"

I might be able to add a custom org-capture-template to handle this, something like:

(setq org-capture-templates
      '(("t" "TODO" entry (file "~/notes/todo.org")
         "* TODO [[%l][<text of link>]]"
         :immediate-finish t)))

And my scraping function could look like:

(defun org-add-todos-list-from-buffer ()
  "Look for TODO comments in current buffer, and add them to org"
  (interactive)
  (dolist (match (matches-in-buffer (format "%s *TODO.*%s?"
                                            (comment-string-strip comment-start nil nil)
                                            (comment-string-strip comment-end nil nil))))
    (org-capture nil "t"))) ;; Somehow pass the desired description to the capture template here?

(matches-in-buffer comes from https://emacs.stackexchange.com/a/7156/11719)

The problem is that I'm not sure how to get from org-capture to my formatted link. I haven't found a template format option that does what I want (the closest thing I think would be to un-mangle the content of %l). I could create the formatted text in my scrape function, but then I don't think I can pass that to the template (unless there is a way to programmatically fill in a prompt?). I suppose I could use something other than org-capture but I don't want to reinvent the wheel. (Maybe there is already a package out there that does exactly what I want?)

Anyone have any tips?