Add Structure in a chunk

Hi, i am wondering how could i add a structure in a chunk from this function:

PHP:

<?php

use Pc\level\generator\ender\populator\EnderPilar;
use pocketmine\block\Block;
use Pc\level\generator\biome\Biome;
use pocketmine\level\{
    ChunkManager,
    generator\Generator,
    generator\noise\Simplex,
    generator\populator\Populator};
use pocketmine\math\Vector3 as Vector3;
use pocketmine\utils\Random;

class Ender extends Generator {

    private static $GAUSSIAN_KERNEL = null;
    private static $SMOOTH_SIZE = 1;
    /** @var ChunkManager */
    protected $level;
    /** @var Random */
    protected $random;
    /** @var Populator[] */
    private $populators = [];
    private $waterHeight = 0;
    private $emptyHeight = 24;
    private $emptyAmplitude = 2;
    private $density = 0;
    /** @var Populator[] */
    private $generationPopulators = [];
    /** @var Simplex */
    private $noiseBase;

    public function __construct(array $options = []){
        if(self::$GAUSSIAN_KERNEL === null){
            self::generateKernel();
        }
    }

    private static function generateKernel(){
        self::$GAUSSIAN_KERNEL = [];

        $bellSize = 1 / self::$SMOOTH_SIZE;
        $bellHeight = 2 * self::$SMOOTH_SIZE;

        for($sx = -self::$SMOOTH_SIZE; $sx <= self::$SMOOTH_SIZE; ++$sx){
            self::$GAUSSIAN_KERNEL[$sx + self::$SMOOTH_SIZE] = [];

            for($sz = -self::$SMOOTH_SIZE; $sz <= self::$SMOOTH_SIZE; ++$sz){
                $bx = $bellSize * $sx;
                $bz = $bellSize * $sz;
                self::$GAUSSIAN_KERNEL[$sx + self::$SMOOTH_SIZE][$sz + self::$SMOOTH_SIZE] = $bellHeight * exp(-($bx * $bx + $bz * $bz) / 2);
            }
        }
    }

    public function getName(): string{
        return "Ender";
    }

    public function getWaterHeight(): int{
        return $this->waterHeight;
    }

    public function getSettings(): array{
        return [];
    }

    public function init(ChunkManager $level, Random $random): void{
        $this->level = $level;
        $this->random = $random;
        $this->random->setSeed($this->level->getSeed());
        $this->noiseBase = new Simplex($this->random, 4, 1 / 4, 1 / 64);
        $this->random->setSeed($this->level->getSeed());
        $pilar = new EnderPilar();
        $pilar->setBaseAmount(0);
        $pilar->setRandomAmount(0);
        $this->populators[] = $pilar;
    }

    public function generateChunk(int $chunkX, int $chunkZ): void{
        $this->random->setSeed(0xa6fe78dc ^ ($chunkX << 8) ^ $chunkZ ^ $this->level->getSeed());

        $noise = $this->noiseBase->getFastNoise3D(16, 128, 16, 4, 8, 4, $chunkX * 16, 0, $chunkZ * 16);

        $chunk = $this->level->getChunk($chunkX, $chunkZ);

        for($x = 0; $x < 16; ++$x){
            for($z = 0; $z < 16; ++$z){

                $biome = Biome::getBiome(Biome::END);
                $biome->setGroundCover([
                    Block::get(Block::OBSIDIAN, 0),

                ]);
                $chunk->setBiomeId($x, $z, $biome->getId());

                for($y = 0; $y < 128; ++$y){

                    $noiseValue = (abs($this->emptyHeight - $y) / $this->emptyHeight) * $this->emptyAmplitude - $noise[$x][$z][$y];
                    $noiseValue -= 1 - $this->density;

                    $distance = new Vector3(0, 64, 0);
                    $distance = $distance->distance(new Vector3($chunkX * 16 + $x, ($y / 1.3), $chunkZ * 16 + $z));

                    if ($noiseValue < 0 && $distance < 150 or $noiseValue < -0.2 && $distance > 1000) {
                        $chunk->setBlockId($x, $y, $z, Block::END_STONE);
                    }
                }
            }
        }

        foreach($this->generationPopulators as $populator){
            $populator->populate($this->level, $chunkX, $chunkZ, $this->random);
        }
    }

    public function populateChunk(int $chunkX, int $chunkZ): void{

    }

    public function getSpawn(): Vector3{
        return new Vector3(0.5, 128, 0.5);
    }
}


(the code comes from teaspoon)
https://github.com/CortexPE/TeaSpoo...CortexPE/level/generator/ender/Ender.php#L105

The world is currently empty and I would like to add the portal structure in 0/0 for example

Here is the field currently


- SunsetTadpole78