Is it possible to postMessage w/ 123forms in my WIX page?

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I want to programmatically pre populate some fields in my 123forms form with data from my app server. Is this possible?

123forms allows me to inject a script where I wrote a postMessage(msg, mysite). Now how do I get a handle to the window to attach a message listener.

#formBuilder1 {
	myInjectedScript {
		// settings -> advanced -> script: https://myapp.com/talk2mywixsite.js
		window.parent.postMessage('iNeedData', 'https://mywixsite.com')
	}
}

wixPage:code {

	// need to listen and reply to messages from 123forms

	// ideal listen on top window to get all messages
	$w.onMessage(processMessage)

	// not ideal bc code for each formBuilder - there will be a lot
	$w('#formBuilder1').onMessage(processMessage)
	function processMessage(event) {
		const origin = event.origin
		const event = event.data
		const source = event.source
		if (origin === 'https://myapp.com' && event === 'iNeedData') {
			source.postMessage({some: 'data'})
		}
	}

}