| "left-middle" | "left-ring" | "left-pinky" | "right-eye" | "right-upper-leg" | "right-lower-leg" | "right-foot" | "right-toes" | "right-shoulder" | "right-upper-arm" | "right-lower-arm" | "right-hand" | "right-thumb" | "right-index" | "right-middle" | "right-ring" | "right-pinky"
value: "none" | "camera" | "head" | "neck" | "hips" | "center-eye" | "spine-top" | "spine-middle" | "spine-bottom" | "left-eye" | "left-upper-leg" | "left-lower-leg" | "left-foot" | "left-toes" | "left-shoulder" | "left-upper-arm" | "left-lower-arm" | "left-hand" | "left-thumb" | "left-index" | "left-middle" | "left-ring" | "left-pinky" | "right-eye" | "right-upper-leg" | "right-lower-leg" | "right-foot" | "right-toes" | "right-shoulder" | "right-upper-arm" | "right-lower-arm" | "right-hand" | "right-thumb" | "right-index" | "right-middle" | "right-ring" | "right-pinky" 