Define the extension attribute in XML

app/code/Vendor/Module/etc/extension_attributes.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Checkout\Api\Data\ShippingInformationInterface">
        <attribute code="address_two" type="string"/>
    </extension_attributes>
</config>

<?xml version="1.0"?>

<extension_attributes for="Magento\Checkout\Api\Data\ShippingInformationInterface">

</extension_attributes>

</config>

Assigning the value for extension attributes in knockout js

app/code/Vendor/Module/view/frontend/web/js/shipping-save-processor-default.js

saveShippingInformation: function () {
                var payload;

                payload = {
                    addressInformation: {
                        shipping_address: quote.shippingAddress(),
                        billing_address: quote.billingAddress(),
                        shipping_method_code: quote.shippingMethod().method_code,
                        shipping_carrier_code: quote.shippingMethod().carrier_code,
                        extension_attributes: {
                            address_two: $('form.form-shipping-address input[name="address2"]').val()
                        }
                    }
                };

                return storage.post(
                    resourceUrlManager.getUrlForSetShippingInformation(quote),
                    JSON.stringify(payload)
                ).done(
                    function (response) {
                        quote.setTotals(response.totals);
                        paymentService.setPaymentMethods(methodConverter(response.payment_methods));
                    }
                ).fail(
                    function (response) {
                        errorProcessor.process(response);
                    }
                );
            }

saveShippingInformation: function () {

var payload;

payload = {

addressInformation: {

shipping_address: quote.shippingAddress(),

billing_address: quote.billingAddress(),

shipping_method_code: quote.shippingMethod().method_code,

shipping_carrier_code: quote.shippingMethod().carrier_code,

extension_attributes: {

address_two: $('form.form-shipping-address input[name="address2"]').val()

}

};

return storage.post(

resourceUrlManager.getUrlForSetShippingInformation(quote),

JSON.stringify(payload)

).done(

function (response) {

quote.setTotals(response.totals);

paymentService.setPaymentMethods(methodConverter(response.payment_methods));

}

).fail(

function (response) {

errorProcessor.process(response);

}

);

}

Save Extension Attribute to quote table using beforeSaveAddressInformation method using Plugin

app/code/Vendor/Module/Model/Checkout/ShippingInformationManagementPlugin.php

namespace Vendor\Module\Model\Checkout;
/**
 * Class ShippingInformationManagementPlugin
 * @package Oye\Deliverydate\Model\Checkout
 */
class ShippingInformationManagementPlugin
{

    protected $quoteRepository;

    /**
     * @param \Magento\Quote\Model\QuoteRepository $quoteRepository
     */
    public function __construct(
        \Magento\Quote\Model\QuoteRepository $quoteRepository
    ) {
        $this->quoteRepository = $quoteRepository;
    }

    /**
     * @param \Magento\Checkout\Model\ShippingInformationManagement $subject
     * @param $cartId
     * @param \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation
     */
    public function beforeSaveAddressInformation(
        \Magento\Checkout\Model\ShippingInformationManagement $subject,
        $cartId,
        \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation
    ) {
        $extAttributes = $addressInformation->getExtensionAttributes();
        $address2=$extAttributes->getAddressTwo();

        $quote = $this->quoteRepository->getActive($cartId);
        
        $quote->setShippingAddressTwo($shippngaddress2);    
        $this->quoteRepository->save($quote);;

    }
}

namespace Vendor\Module\Model\Checkout;

/**

* Class ShippingInformationManagementPlugin

* @package Oye\Deliverydate\Model\Checkout

class ShippingInformationManagementPlugin

{

protected $quoteRepository;

/**

* @param \Magento\Quote\Model\QuoteRepository $quoteRepository

public function __construct(

\Magento\Quote\Model\QuoteRepository $quoteRepository

) {

$this->quoteRepository = $quoteRepository;

}

/**

* @param \Magento\Checkout\Model\ShippingInformationManagement $subject

* @param $cartId

* @param \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation

public function beforeSaveAddressInformation(

\Magento\Checkout\Model\ShippingInformationManagement $subject,

$cartId,

\Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation

) {

$extAttributes = $addressInformation->getExtensionAttributes();

$address2=$extAttributes->getAddressTwo();

$quote = $this->quoteRepository->getActive($cartId);

$quote->setShippingAddressTwo($shippngaddress2);

$this->quoteRepository->save($quote);;

}

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