Running XeFG on stellar blade through OptiScaler

Hi, i have intel arc b580 and i want to use xess fg on stellar blade with optiscaler. But I can't. When i use dlss spoofing i can only enable dlss upscaler but I can't enable dlss fg, its locked. I tried fsr fg but even though fsr fg is working optiscaler doesn't show it up as it's "enabled" so I cannot change it to xess fg.

Upscaler works fine btw so there isn't a problem on that regard. Its just the fg. Fsr fg works fine and all but i would like to use 3x mfg with xess.