Pass data from browser's native window object to Wix's HTML element?

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I’m loading an analytics script at the foot of my wix site’s body element. It writes variables to the browser’s native window object. I want to copy that data to a hidden form element in a form that is rendered with a Wix HTML Element. Wix renders the HTML Element in an iframe that it hosts from a different hostname. So the browser’s same origin security policy won’t let me post messages to it with normal javascript.

I’ve noticed that I can write to the iframe with:

$w.onReady(function () {
   var iframe = $w("#html1");
   iframe.postMessage('hi');
});

I need to be able to do one of these three things:

  1. A way to write directly from my analytics script to the iframe with normal javascript.
  2. Read the browser’s native window object from the $w.onReady() context, so that I can relay that data to the iframe with the code snippet above.
  3. Somehow pass a message to the $w.onReady() context from the native browser javascript context, so that I can relay that message to the iframe with the code snippet above.