Missing the pluginOptions from pi_flexforms to be more flexible to modify backend output.
Also the data of the item record could be helpful
For instance show options set in pi_flexforms and tt_content element itself
$flexformService = GeneralUtility::makeInstance(FlexFormService::class);
$pluginOptions = $flexformService->convertFlexFormContentToArray($record['pi_flexform']);
$view->assignMultiple([
...
'pluginOptions' => $pluginOptions,
'data' => $record,
]);