tt_content.php

<?php
defined('TYPO3') || die();

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
    'Bison',
    'Recommender',
    'Recommender'
);

$pluginSignature = 'bison_recommender';
$GLOBALS['TCA']['tt_content']['types']['list']['subtypes_addlist']['bison_recommender'] = 'pi_flexform';
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPiFlexFormValue(
    $pluginSignature,
    'FILE:EXT:bison/Configuration/FlexForms/Recommender.xml'
);

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
    'Bison',
    'Journal',
    'Journal'
);