AORUS RTX 5090 XTREME detected as fan controller, but RGB not working

Hi,
I’m using a Gigabyte AORUS RTX 5090 XTREME 32G with Z790 Aorus Master X (rev 1.0).
SignalRGB detects it as a fan controller, but no RGB device or effects appear.
Tested: full reinstall, latest BIOS/firmware, RGB enabled in BIOS, no other RGB apps running.
Saw that MSI 5090 users needed a custom plugin.
→ Is a plugin planned for this model?
Happy to help test. Thanks!