If the chicken is boiled from raw not cooked bones then it’s chicken stock. From cooked bones it’s chicken broth. Either way, it’s gold. Yes you can drink it, Add it to other soups, general cooking. The point is nothing wrong with that full of nutrients. a cup of that every morning with a dash of salt is great on a cold day. Enjoy.
For the most part, it is water and salt. But it also has a little bit of protein
As for nutritional value, it’s nutritious, but not substantially so. Meaning, if you were to make a soup with it, most of the nutrition is what’s going to be in the actual soup.
It’s useful and has some value to it, but it’s not a be all end all