odoo16/addons/base_install_request/data/mail_templates_module_install.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="base_install_request.base_module_install_review_description">
        <p t-if="any(app.application for app in apps)">The following apps will be installed:</p>
        <div class="container-fluid">
            <ul class="list-unstyled row">
                <t t-foreach="apps" t-as="app">
                    <li class="mt8 col-lg-6" t-if="app.application">
                        <div>
                            <img width="24px" height="24px" class="img-fluid" t-att-src="app.icon"/>
                            <t t-esc="app.shortdesc"/>
                        </div>
                    </li>
                </t>
            </ul>
        </div>
    </template>
</odoo>