Do you have the full build or a custom build motherboard? I don’t think there is any provision for RGB on the X11SPH. I think there is support for accessing certain types of RGB from within Unraid, see eg https://www.reddit.com/r/unRAID/comments/glry47/rgb_lighting_control_for_unraid_finally/
I’d look at these for ideas of simplest to most complicated;
https://forum.45homelab.com/t/i-recommend-this-100-fan-mod/958
https://forum.45homelab.com/t/best-fan-upgrades/105/33?u=digitalgarden
https://forum.45homelab.com/t/moving-air-fan-controller-fan-rgb-zigbee/687