magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontFillGuestShippingInfoActionGroup.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <!-- Fill data in checkout shipping section -->
    <actionGroup name="StorefrontFillGuestShippingInfoActionGroup">
        <annotations>
            <description>Fills in the provided Customer details on the Storefront Checkout page under the 'Shipping Address' section.</description>
        </annotations>
        <arguments>
            <argument name="customerData" defaultValue="Simple_UK_Customer_For_Shipment"/>
        </arguments>
        
        <fillField selector="{{CheckoutShippingGuestInfoSection.email}}" userInput="{{customerData.email}}" stepKey="fillEmailAddressField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.firstName}}" userInput="{{customerData.firstName}}" stepKey="fillFirstNameField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.lastName}}" userInput="{{customerData.lastName}}" stepKey="fillLastNameField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.company}}" userInput="{{customerData.company}}" stepKey="fillCompanyField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.street}}" userInput="{{customerData.streetFirstLine}}" stepKey="fillStreetAddressFirstLineField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.street2}}" userInput="{{customerData.streetSecondLine}}" stepKey="fillStreetAddressSecondLineField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.city}}" userInput="{{customerData.city}}" stepKey="fillCityField"/>
        <fillField selector="{{CheckoutShippingGuestInfoSection.telephone}}" userInput="{{customerData.telephone}}" stepKey="fillPhoneNumberField"/>
    </actionGroup>
</actionGroups>