A few days ago I was reading a chocolate bar wrapper (as you do) and noticed that there’s quite of lot of protein in chocolate: usually about 8g per 100g. In fact, there’s a lot of protein in almost everything - Weetabix cereal has about 10g compared to about 12g in chicken. Not “complete” protein of course, but your body will do the mixing for you; just eat a varied diet. Nothing to worry about. Our cocoa powder tin claims about 22% protein, which is rather a lot.
In other chocolate news, dairy-free chocolate is full of lovely healthy anti-oxidants. Add milk though, and the effect vanishes.
If you now fancy some choc, eat Green And Black’s chocolate I think it’s the best there is, for you, the farmers and the environment.