first commit

plugins/fields/usergrouplist/params/usergrouplist.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<form>
+	<fields name="fieldparams">
+		<fieldset name="fieldparams">
+			<field
+				name="multiple"
+				type="list"
+				label="PLG_FIELDS_USERGROUPLIST_PARAMS_MULTIPLE_LABEL"
+				filter="integer"
+				validate="options"
+				>
+				<option value="">COM_FIELDS_FIELD_USE_GLOBAL</option>
+				<option value="1">JYES</option>
+				<option value="0">JNO</option>
+			</field>
+		</fieldset>
+	</fields>
+</form>

plugins/fields/usergrouplist/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Fields.usergrouplist
+ *
+ * @copyright   (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\PluginInterface;
+use Joomla\CMS\Factory;
+use Joomla\CMS\Plugin\PluginHelper;
+use Joomla\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+use Joomla\Event\DispatcherInterface;
+use Joomla\Plugin\Fields\UsergroupList\Extension\UsergroupList;
+
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   4.3.0
+     */
+    public function register(Container $container)
+    {
+        $container->set(
+            PluginInterface::class,
+            function (Container $container) {
+                $plugin     = new UsergroupList(
+                    $container->get(DispatcherInterface::class),
+                    (array) PluginHelper::getPlugin('fields', 'usergrouplist')
+                );
+                $plugin->setApplication(Factory::getApplication());
+
+                return $plugin;
+            }
+        );
+    }
+};

plugins/fields/usergrouplist/src/Extension/UsergroupList.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Fields.usergrouplist
+ *
+ * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Plugin\Fields\UsergroupList\Extension;
+
+use Joomla\Component\Fields\Administrator\Plugin\FieldsPlugin;
+use Joomla\Event\SubscriberInterface;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Fields UsergroupList Plugin
+ *
+ * @since  3.7.0
+ */
+final class UsergroupList extends FieldsPlugin implements SubscriberInterface
+{
+}

plugins/fields/usergrouplist/tmpl/usergrouplist.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Fields.Usergrouplist
+ *
+ * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die;
+
+use Joomla\Component\Users\Administrator\Helper\UsersHelper;
+
+$value = $field->value;
+
+if ($value == '') {
+    return;
+}
+
+$value  = (array) $value;
+$texts  = [];
+$groups = UsersHelper::getGroups();
+
+foreach ($groups as $group) {
+    if (in_array($group->value, $value)) {
+        $texts[] = htmlentities(trim($group->text, '- '));
+    }
+}
+
+echo htmlentities(implode(', ', $texts));

plugins/fields/usergrouplist/usergrouplist.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="plugin" group="fields" method="upgrade">
+	<name>plg_fields_usergrouplist</name>
+	<author>Joomla! Project</author>
+	<creationDate>2016-03</creationDate>
+	<copyright>(C) 2016 Open Source Matters, Inc.</copyright>
+	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>3.7.0</version>
+	<description>PLG_FIELDS_USERGROUPLIST_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Plugin\Fields\UsergroupList</namespace>
+	<files>
+		<folder>params</folder>
+		<folder plugin="usergrouplist">services</folder>
+		<folder>src</folder>
+		<folder>tmpl</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/plg_fields_usergrouplist.ini</language>
+		<language tag="en-GB">language/en-GB/plg_fields_usergrouplist.sys.ini</language>
+	</languages>
+	<config>
+		<fields name="params">
+			<fieldset name="basic">
+				<field
+					name="multiple"
+					type="radio"
+					label="PLG_FIELDS_USERGROUPLIST_PARAMS_MULTIPLE_LABEL"
+					layout="joomla.form.field.radio.switcher"
+					default="0"
+					filter="integer"
+					>
+					<option value="0">JNO</option>
+					<option value="1">JYES</option>
+				</field>
+			</fieldset>
+		</fields>
+	</config>
+</extension>