I don't see the mac os installer inside my boot menu (i5 9600k, GTX 970)

Whenever I try to go install mac os through the boot menu, I don't see it in the second slot. I've tried almost everything in my BIOS and still nothing. The only option other than booting into windows and reseting my NVRAM gives me this error:
00:000 00:000 OCB: LoadImage failed - Unsupported