Shoyu: Japanese soy sauce is a popular ramen seasoning in the Kanto region of central Japan, originally emanating from Yokohama. Traditionally it's paired with clear to brown chicken, seafood, and occasionally pork or beef-based broths, though these days shoyu is used willy-nilly by ramen chefs throughout Japan.
IM injections can be given in a large muscle in the buttock, upper arm, or thigh. It is best to use the buttock or thigh instead of the arm if: the amount to inject is more than 2 ml (2 cc). (But you should never inject more than 3 ml (3 cc) in a single dose. Use 2 injections instead.)
Use a tablespoon. A single 'shot' can vary from 20 to 60 mL, depending upon which country[1] you live in. I'll assume you are in the US, in which case a single shot is defined as 44 mL or 1.5 fluid ounces. 1 tablespoon equals 14.7868 mL. Use three of them, and that is ~44 mL.