\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin(
    array(
        'LLL:EXT:example/Resources/Private/Language/locallang_db.xlf:tt_content.headerTeaser',
        'fe_header_teaser',
    ),
    'CType',
    'example'
);

$GLOBALS['TCA']['tt_content']['types']['fe_header_teaser']['showitem'] = '
    --palette--;LLL:EXT:cms/locallang_ttc.xml:palette.general;general,
    pi_flexform;LLL:EXT:example/Resources/Private/Language/locallang_db.xlf:tt_content.headerTeaser.pi_flexform,
    bodytext;LLL:EXT:example/Resources/Private/Language/locallang_db.xlf:tt_content.headerTeaser.text;;richtext:rte_transform[flag=rte_enabled|mode=ts_css],
    image;LLL:EXT:example/Resources/Private/Language/locallang_db.xlf:tt_content.headerTeaser.image,
    media;LLL:EXT:example/Resources/Private/Language/locallang_db.xlf:tt_content.headerTeaser.video,
    --div--;LLL:EXT:cms/locallang_ttc.xml:tabs.access,
    --palette--;LLL:EXT:cms/locallang_ttc.xml:palette.visibility;visibility,
    --palette--;LLL:EXT:cms/locallang_ttc.xml:palette.access;access
';

$GLOBALS['TCA']['tt_content']['columns']['pi_flexform']['config']['ds'][',fe_header_teaser'] = 'FILE:EXT:example/Configuration/FlexForms/FeHeaderTeaser.xml';