Is it possible to add Graphic objects into a staticGroup?

Phaser 3
7

All any overlap does is a rectangle intersect. So it is not interested in color per pixel.
It has nothing to do with the framework. Per pixel collision is rarely used, because it’s rarely necessary. In your case however…

Let’s try to have it make more sense.
From the example (in C#):

   static bool PerPixelCollision(Sprite a, Sprite b)
{
    // Get Color data of each Texture
    Color[] bitsA = new Color[a.Texture.Width * a.Texture.Height];
    a.Texture.GetData(bitsA);
    Color[] bitsB = new Color[b.Texture.Width * b.Texture.Height];
    b.Texture.GetData(bitsB);

    // Calculate the intersecting rectangle
    int x1 = Math.Max(a.Bounds.X, b.Bounds.X);
    int x2 = Math.Min(a.Bounds.X + a.Bounds.Width, b.Bounds.X + b.Bounds.Width);

    int y1 = Math.Max(a.Bounds.Y, b.Bounds.Y);
    int y2 = Math.Min(a.Bounds.Y + a.Bounds.Height, b.Bounds.Y + b.Bounds.Height);

     // For each single pixel in the intersecting rectangle
     for (int y = y1; y < y2; ++y)
     {
         for (int x = x1; x < x2; ++x)
         {
             // Get the color from each texture
             Color a = bitsA[(x - a.Bounds.X) + (y - a.Bounds.Y)*a.Texture.Width];
             Color b = bitsB[(x - b.Bounds.X) + (y - b.Bounds.Y)*b.Texture.Width];

             if (a.A != 0 && b.A != 0) // If both colors are not transparent (the alpha channel is not 0), then there is a collision
             {
                 return true;
             }
         }
     }
    // If no collision occurred by now, we're clear.
    return false;
}

This is all you need.
What part do you not get?