TAB with right-hand fingerings?

[Blöchl Bernhard]

The left hand fingering is defined in the TAB, but how to get right a 
hand fingering?
I tried this:

#(define RH rightHandFinger)
\new TabStaff \relative c {
   \set strokeFingerOrientations = #'( down)
  c-\RH #1 e-\RH #2 g-\RH #3 c-\RH #4
}

Compiles, but without fingering

Thanks for Help

PS: I ask for capital letters for the right hand fingering in a separate 
thread.