TYPO3 custom content inline elements - typo3

Question

Is it possible to create a custom content element (type inline) where i can choose from the default typo3 elements (text with image, grids, html)?
At the moment i have an custom content with a new table an can insert my own element as a child.
I would like to give the editor the opprtunity to create an element like an tag and insert whatever he wants.
i have this code
'parent_uid' => [
'config' => [
'type' => 'select',
'renderType' => 'selectSingle',
'items' => [
[
'',
0,
],
],
'default' => 0,
'foreign_table' => 'tt_content',
'foreign_table_where' => 'AND tt_content.pid=###CURRENT_PID### AND tt_content.sys_language_uid IN (-1, ###REC_FIELD_sys_language_uid###)',
],
],
'parent_table' => [
'config' => [
'type' => 'passthrough',
],
],
and this
$tabs = [
'k_custom_content_tab' => [
'exclude' => true,
'label' => 'Field label',
'config' => [
'appearance' => [
'collapseAll' => '1',
'enabledControls' => [
'dragdrop' => '1',
],
'levelLinksPosition' => 'bottom',
'useSortable' => '1',
],
'foreign_field' => 'parent_uid',
'foreign_table' => 'k_custom_content_tab',
'foreign_table_field' => 'parent_table',
'maxitems' => '20',
'minitems' => '1',
'type' => 'inline',
],
],
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns(
'tt_content',
$tabs
);