Loading GLSL shaders and using mpv.input without MPV Shim?

[meowk]

Hey, i'm trying to get glsl shaders to work with jellyfin media player, unfortunately my config doesn't seem to work at all no matter what i try, at the same time, i don't know how to use mpv.input neither. It seems possible with mpv shim, however if possible i'd rather just use the default app