Is your feature request related to a problem? Please describe.
I always wanted to have special effects on my screen for videos.
like for example: Rethinking Voxels kombined with Sinus Shader.

Describe the solution you'd like
Being able to load two or multiple shaders at once.

Describe alternatives you've considered
Get the wobbly (and other effects) using a fabric mod. Didn't find anything tho.

Additional context
I'm trying to use these shaders with replay mod.

This is not how shaders work. Shaders are programs that run on the GPU, and no GPU can handle two shaders at once.