Assign metaballs to trails form a particle system currently switching from C4d to Blender, I try to reproduce some classic motion graphic effects in blender.

To illustrate my question, here's a link to watch (6min 45s): https://mattrunks.com/fr/formations/cinema-4d/eclaboussures-2d-x-particles
I am stuck when I want to assign metaballs to my trails. I could render my particles as object with a meta ball as reference, but the look will be some spheres and I want more a stroke look. Like this ...

Is there a way to achieve this?
In particle system you have render, select object and now your trail is rendering a specific object that you select