Now I finally understand...!

I don’t think it will do all of them at once, but I’ll defer to @David_Tschumperle on that.

If you set the “Output Messages” to “Verbose (Layer Name)” the command used to generate that filter effect will be visible as the layer name in GIMP. For the B&W film emulation collages:

[G'MIC] B&W films - collage: -gimp_emulate_film_collage_bw 512,4,16,0