WooCommerce: Account Password Field in Checkout page

My main goal is to change the "create an account" checkout to register the email as a username. The easy way I thought of was changing "Account Password" from password to email to override user_login.

However, I can't seem to find where the "Password" text box is coming from. I know that this the code I needed under form-billing.php, but I am unsure how only password is showing considering there's a for-loop.

<?php foreach ( $checkout->checkout_fields['account'] as $key => $field ) : ?>

    <?php woocommerce_form_field( $key, $field, $checkout->get_value( $key ) ); ?>

<?php endforeach; ?>

Any advice is appreciated.

via Chebli Mohamed