Particles ?

Verge3d does not support particles natively but you could try to implement threejs particles.

However sprite sheets are probably the easiest. You can create particle renderings in blender or in a motion graphics program. Rendered image sequence with alpha then create a large grid based image you can traverse with UVs via key frames or using the animate puzzle.

You can set the particles to render as an object and use the “bake” method described here:

Baking Particles for Sketchfab (Blender Edition)

On the page it sends you to scroll down to the third revision of the script for Blender 2.8+:

https://blender.stackexchange.com/questions/4956/convert-particle-system-to-animated-meshes

I also had to scale the particles to zero at the end of their lifetime using this method to get them to disappear.

https://blender.stackexchange.com/questions/114300/how-to-affect-particle-size-over-time

Someone sells an add-on on Gumroad that does it too but I haven’t tried that: https://blenderartists.org/t/cake-particles-bake-your-particles-as-keyframed-objects/1378059

There may be other ways, I’m not a Blender guru.