magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/AdminInsertWidgetToCmsPageContentActionGroup.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">
    <actionGroup name="AdminInsertWidgetToCmsPageContentActionGroup">
        <annotations>
            <description>Insert widget to CMS Page content field. You are on CMS edit page, content tab is expanded.</description>
        </annotations>

        <arguments>
            <argument name="widgetType" type="string" defaultValue="CMS Page Link"/>
        </arguments>
        <waitForElementVisible selector="{{CmsNewPagePageActionsSection.insertWidget}}" stepKey="waitForInsertWidgetElementVisible"/>
        <click selector="{{CmsNewPagePageActionsSection.insertWidget}}" stepKey="clickOnInsertWidgetButton"/>
        <waitForPageLoad stepKey="waitForPageLoadAfterClickOnInsertWidgetButton"/>
        <waitForElementVisible selector="{{WidgetSection.InsertWidgetTitle}}"  stepKey="waitForInsertWidgetTitle"/>
        <selectOption selector="{{WidgetSection.WidgetType}}" userInput="{{widgetType}}" stepKey="selectWidgetType"/>
    </actionGroup>
</actionGroups>