Can I "shape" the sound of words spoken by Pepper with Phonetic transcription?

I am using Aldebaran/Softbank Robotics Pepper with Choregraphe software. There are some loan words in my dialogs. When Pepper say these words they often don’t sound natural.

e.g. the german word Demenz (eng: dementia) The first e is to long. I imagine some synax like that De[0.5]menz or phonetic transcription [deˈmɛnʦ].

Is this possible?

tts.setLanguage("English")
tts.say("\toi=lhp\‘zi.R+o&U \toi=orth\")
# Same as
tts.say("zero")