Iirc just rice and beans cover all essential amino acids so nothing to worry about. Obviously, in the real world scenario the diet will be more varied than that with veggies and grains and stuff so the vitamins/fatty acids will be covered as well. If you want to get real numbers there are apps for this, for example Chronometer - pretty cool. So overall I’d say don’t worry about it, just eat enough and different foods, supplement with B12 and check the bloodwork yearly.