CustomForm

public function sendCustomForm(Player $player): void {
        $form = (new CustomForm("Custom Form", function (Player $player, $data) {
            if($data === null) return;
            $player->sendMessage("You input name: ".$data[1].", and age: ".$data[2]);
        }))
        ->addLabel("Write as required:")
        ->addInput("Your Name:")
        ->addSlider("Your age:", 1, 10);
        $player->sendForm($form);
    }