$this->derivatives[$key] = $base_plugin_definition;
$this->derivatives[$key]['title'] = $title;
$this->derivatives[$key]['route_parameters'] = ['placeholder' => $key];
$this->derivatives[$key] = $base_plugin_definition;
$this->derivatives[$key]['title'] = $title;
$this->derivatives[$key]['route_parameters'] = ['placeholder' => $key];