If you are looking for “true 3D” you will not find it. In order to see 3D you need parallax or a difference in view point from your left and right eyes. Your eye spacing is so close together in comparison with the distance to the fireworks you get the same effect if you watched them with one eye.
Patterned fireworks available that make Saturn rings, or Smiley faces but, in general, the burst will always be spherical.