Output standard template script data

I want users to confirm a web form action in a standard template before its POST'ed to prevent them accidentally erasing some data in the next function.

I have this script in my html which returns true or false on test, but can't find if its possible to pass this onto the connected function node as a payload?

function confirm() {
  var result = confirm("If you click OK your access key will be overwritten");
  if (result == true) {
    **I want to pass true as the payload**;
  } else {
    **I want to pass false as the payload**;

In my html body:

<form ="form" action="" method="post">
<input type="submit" onclick="confirm()" class="button" value="Update" />

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