When I first moved here I was a lodger in an East London semi, my landlords made chili that was full of mushrooms and served with rice. To say the least, this Arkansas girl was puzzled. Then a couple of years later in the Midlands, a work colleague invited us to dinner and what did she serve but chili with rice.
So yeah, it's a thing.
I don't like any chili mixes over here and just make my own Deep South Tex-Mex approximation.