FIXME: these are not properties yet, therefore we have to work around.
When we have virtual properties, the following code should get re-added:
$this->buildProperty(
$definition,
$metaModel->getAttribute('varbase'),
$inputScreen->getProperty('varbase')['info']
);
$this->buildProperty(
$definition,
$metaModel->getAttribute('vargroup'),
$inputScreen->getProperty('vargroup')['info']
);