If you want to develop your own template for the real estate presentation and need to access the real estate data from WP-ImmoMakler, please use the following PHP code:
$property_data = new \ImmoMakler\Data\PropertyData;
if ( $property_data->show('wohnflaeche') ) {
echo esc_html($property_data->get_label('wohnflaeche'));
echo $property_data->get_value('wohnflaeche');
}