$ hyprshade on blue-light-filter
This one is also working for me.
With shader below, I only changed username and after saving it’s also working.
screen_shader = /home/mee/.config/hypr/shaders.frag
# /home/mee/.config/hypr/shaders.frag
//
// Example blue light filter shader.
//
precision mediump float;
varying vec2 v_texcoord;
uniform sampler2D tex;
void main() {
vec4 pixColor = texture2D(tex, v_texcoord);
pixColor[2] *= 0.8;
gl_FragColor = pixColor;
}