ds-site/Configuration/TCA/Overrides/tt_content_admonition.php

<?php

declare(strict_types=1);

use TYPO3\CMS\Core\Utility\ArrayUtility;
use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;

(static function (string $extensionKey, string $tableName, string $contentType) {
    $languagePath = 'LLL:EXT:' . $extensionKey . '/Resources/Private/Language/locallang_tca.xlf:' . $tableName . '.';

    ArrayUtility::mergeRecursiveWithOverrule($GLOBALS['TCA'][$tableName], [
        'ctrl' => [
            'typeicon_classes' => [
                $contentType => 'content-idea',
            ],
        ],
        'types' => [
            $contentType => [
                'showitem' => implode(',', [
                    '--div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:general',
                    '--palette--;;general',
                    'header_layout',
                    'bodytext',
                    '--div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.appearance',
                    '--palette--;;frames',
                    '--palette--;;appearanceLinks',
                    '--div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:language',
                    '--palette--;;language',
                    '--div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:access',
                    '--palette--;;hidden',
                    '--palette--;;access',
                    '--div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:categories',
                    'categories',
                    '--div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:notes',
                    'rowDescription',
                    '--div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:extended',
                ]),
                'columnsOverrides' => [
                    'bodytext' => [
                        'config' => [
                            'enableRichtext' => true,
                            'richtextConfiguration' => 'default',
                        ],
                    ],
                ],
            ],
        ],
    ]);

    ExtensionManagementUtility::addTcaSelectItem(
        $tableName,
        'CType',
        [
            'label' => $languagePath . $contentType,
            'value' => $contentType,
            'icon' => 'content-idea',
            'group' => 'default',
        ],
        'image',
        'after'
    );
})('ds_site', 'tt_content', 'admonition');