[TYPO3-english] excplicitAllow / -deny Hook since 7.x ?

[Hendrik Reimers]

Hey there,

i'm looking for a hook in TYPO3 7.6 for injecting new items to the BE Usergroup managament, especially explicit_values.
In 6.x i've made it by these DataProcessor and FormEngine hooks:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects']['TYPO3\\CMS\\Backend\\Form\\DataPreprocessor'] = array(
	'className' => 'KERN23\\ContentDesigner\\Xclass\\DataPreprocessor',
);
$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects']['TYPO3\\CMS\\Backend\\Form\\FormEngine'] = array(
	'className' => 'KERN23\\ContentDesigner\\Xclass\\FormEngine',

Thank you for support!