ext_localconf.php

<?php

call_user_func(static function ($packageKey) {
    $GLOBALS['TYPO3_CONF_VARS']['FE']['addAllowedPaths'] .= ',' . $packageKey;

    // Enable for Frontend and Backend at the same time
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-preProcess'][$packageKey] = \Ssch\Typo3Encore\Integration\PageRendererHooks::class . '->renderPreProcess';
    // Add collected assets to page cache
}, 'typo3_encore');

$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['formDataGroup']['tcaDatabaseRecord'][\Ssch\Typo3Encore\Form\FormDataProvider\RichtextEncoreConfiguration::class] = [
    'depends' => [\TYPO3\CMS\Backend\Form\FormDataProvider\TcaText::class],
];

$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['formDataGroup']['flexFormSegment'][\Ssch\Typo3Encore\Form\FormDataProvider\RichtextEncoreConfiguration::class] = [
    'depends' => [\TYPO3\CMS\Backend\Form\FormDataProvider\TcaText::class],
];