Create Spritesheet Texture from Unity Shuriken

Hi,
I am working for a mobile game on many differents FX, and I want to know if it’s possible to create/render a spritesheet texture on Unity from an FX created with Shuriken (Like it can be do on Timeline FX.) ?

The goal is to reduce the number of drawcall.

Thanks you

Last resort - you could do a video screen capture and clean up in 2D program, then bring back in and create a spritesheet.
Have you checked the asset store for something that does this?