you are not the only one that tries to do this. although i managed to export the foam particles as an alembic file, but in order to do that you have to install the Phoenix nightly version. After the installation watch this Chaos Phoenix 4.41.02 Nightly - Combine Cascade Liquids - YouTube
But still, in order for the particles to look good have to be very small and that makes the file really big. Another idea I had is to generate niagara particles from this alembic geometry, but niagara can’t spawn particles from the geometry cache. And now I am running out of ideas. I was, in the end, thinking to make a nice volumetric material and apply it, but I don’t think will look good in the end. If you have another idea, just keep me posted…Only if there is a way to read these velocity particles from the foam or splashes… but how???