ProductLinksData.xml

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

<entities xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:DataGenerator/etc/dataProfileSchema.xsd">
    <entity name="OneSimpleProductLink" type="product_links">
        <requiredEntity type="product_link">ProductLinkSimple1</requiredEntity>
    </entity>
    <entity name="OneMoreSimpleProductLink" type="product_links">
        <requiredEntity type="product_link">ProductLinkSimple2</requiredEntity>
    </entity>
    <entity name="TwoSimpleProductLinks" type="product_links">
        <array key="items">
            <item>ProductLinkSimple1</item>
            <item>ProductLinkSimple2</item>
        </array>
    </entity>
</entities>