Confusion in close loop block diagram

I am studying chapter 4 of Dorf title Modern Control systems(11 edition)

I am trying to use MATLAB or Labview to implement block diagram for open loop control systems for speed control of an armature controlled DC motor

I have also attached the figure of book

I understand that the rightmost block $$\\frac{1}{js+b}\$$ will be in feedback with $$\K_b\$$ block. But what will be the relation of feedback block $$\K_b\$$ with the two left most blocks ($$\1/R_a\$$ and $$\K_m\$$ in series) ?? Independent individual feedback relation with the two left most blocks ($$\1/R_a\$$ and $$\K_m\$$ in series) or the series combination of rightmost block $$\\frac{1}{js+b}\$$ and $$\K_b\$$ will be in feedback with the two left most blocks ($$\1/R_a\$$ and $$\K_m\$$ in series)