Unity Editor : How to create in code Texture2D and save as file an PNG image lunch from menu?

CreatingPNG.cs

sing System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using UnityEditor;
public class CreatingPNG : MonoBehaviour
{
    public static Texture2D CreateTexture()
    {
        int width = 100;
        int height = 100;

        Texture2D texture = new Texture2D(width, height, TextureFormat.ARGB32, false);
        texture.filterMode = FilterMode.Point;



        for (int i = 0; i < width; i++)
        {
            for (int j = 0; j < height; j++)
            {
                float r = (float)((float)i / width);

                if(j > i)
                {
                    texture.SetPixel(j, height - 1 - i, new Color(r, r, r, 1.0f));
                }
                else
                {
                    texture.SetPixel(j, height - 1 - i, new Color(r, r, r, 0.2f));
                }
            }
        }
        texture.Apply();
        return texture;
    }

    Texture2D SaveTexture(Texture2D texture, string filePath)
    {
        byte[] bytes = texture.EncodeToPNG();
        FileStream stream = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write);
        BinaryWriter writer = new BinaryWriter(stream);
        for (int i = 0; i < bytes.Length; i++)
        {
            writer.Write(bytes[i]);
        }
        writer.Close();
        stream.Close();
        DestroyImmediate(texture);
        //I can't figure out how to import the newly created .png file as a texture
        
        AssetDatabase.Refresh();
        Texture2D newTexture = (Texture2D)AssetDatabase.LoadAssetAtPath(filePath, typeof(Texture2D));
        if (newTexture == null)
        {
            Debug.Log("Couldn't Import");
        }
        else
        {
            Debug.Log("Import Successful");
        }
        return newTexture;
    }

    [MenuItem("Examples/Save Texture to file")]
    static void Apply()
    {

        Texture2D texture = CreateTexture();
        texture.name = "lol.png";

        var path = EditorUtility.SaveFilePanel(
            "Save texture as PNG",
            "",
            texture.name + ".png",
            "png");

        if (path.Length != 0)
        {
            var pngData = texture.EncodeToPNG();
            if (pngData != null)
                File.WriteAllBytes(path, pngData);
        }
    }
}