Turn on a multi-functional pressure cooker (such as Instant Pot(R)) and select Saute function. Add olive oil and chicken. Sprinkle with flour and cook until browned on all sides, about 5 minutes. Turn off Saute function. Add green chile peppers, jalapenos, rice, tomato, onion, Anaheim chile, Cheddar cheese, salt, seasoned salt, and pepper; pour in chicken stock and mix to combine.
Close and lock the lid. Select high pressure according to manufacturer's instructions; set timer for 18 minutes. Allow 10 to 15 minutes for pressure to build.
Release pressure carefully using the quick-release method according to manufacturer's instructions, about 5 minutes. Unlock and remove the lid. Adjust seasoning with salt and pepper.
