Control rig "set multiple controls" Vector2d

I am trying to experiment with the Face_ControlBoard_CtrlRig and I seem to get stuck a lot!

I wanted to set some of the controls via a paramter, but the Rig Graph does not really support loops, like For each? I then found that there is a Set Multiple Controls Vector2D (etc.), but promote to variabel does not seem to work and i am not able to see what type of area the “Entries” is. ( There is no documentation for The “Set Multiple Controls …” ??)