Code for form to autofill based on inputted email

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I am trying to create a code that reads the first input field of a WIX form “email” Once it has been filled in, I want the code to autofill several fields based on the contact information that has been saved from a previous form.

I am using the Desktop version of Editor.

This is the code that I have so far. I do know the first 2 lines are not correct - but all the examples I am looking at use those. Not sure where to go from here.

import { Permissions, webMethod } from 'wix-web-module';
import { contacts } from 'wix-crm-backend';

$w.onReady(() => {
    $w("#emailInput").onInput((event) => {
        const contactEmail = $w("#emailInput").value;
        return contacts.getContact(contactEmail);
        fillContactForm();
    })

})

async function fillContactForm() {
    $w("#firstName").value = contacts.contactDetails.firstName;
    $w("#lastName").value = contacts.contactDetails.lastName;
    //these are guesses.  How do I find out the names of each field for the contacts?
}

A similar tutorial that I am trying to modify from Member to Contacts

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