Get shapes from face_mesh with landmarks in desktop version

[SergeyGalaxyOrsik]

I'm trying to get shapes like

classification {
  index: 49
  score: 0.69999576
  label: "mouthUpperUpRight"
}
classification {
  index: 50
  score: 3.5180938e-07
  label: "noseSneerLeft"
}
classification {
  index: 51
  score: 8.41376e-06
  label: "noseSneerRight"
}

I get this example from face_blendshapes_out.prototxt

And I don't know how to implement it in file like demo_run_graph_main.cc