Add Field in Checkout Woocommerce Block Programmatically

functions.php

add_action(
	'woocommerce_init',
	function() {
		woocommerce_register_additional_checkout_field(
			array(
				'id'            => 'namespace/delivery-date-id',
				'label'         => 'Delivery Date',
				'optionalLabel' => 'Delivery Date (optional)',
				'location'      => 'address',
				'required'      => true,
				'attributes'    => array(
					'autocomplete'     => 'delivery-date-id',
					'aria-describedby' => 'some-element',
					'aria-label'       => 'custom aria label',
					'title'            => 'Title to show on hover',
					'data-custom'      => 'custom data',
				),
			),
		);
	}
);