ext_localconf.php

<?php
defined('TYPO3_MODE') || die('Access denied.');

call_user_func(
    function($extKey)
    {

        \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
            'Slub.SlubEntityfacts',
            'Entityfactslisting',
            [
                'EntityFact' => 'show'
            ],
            // non-cacheable actions
            [
            ]
        );

    // wizards
    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig(
        'mod {
            wizards.newContentElement.wizardItems.plugins {
                elements {
                    entityfactslisting {
                        icon = EXT:slub_entityfacts/Resources/Public/Icons/user_plugin_entityfactslisting.svg
                        title = LLL:EXT:slub_entityfacts/Resources/Private/Language/locallang_db.xlf:tx_slub_entityfacts_domain_model_entityfactslisting
                        description = LLL:EXT:slub_entityfacts/Resources/Private/Language/locallang_db.xlf:tx_slub_entityfacts_domain_model_entityfactslisting.description
                        tt_content_defValues {
                            CType = list
                            list_type = slubentityfacts_entityfactslisting
                        }
                    }
                }
                show = *
            }
       }'
    );
    },
    $_EXTKEY
);