HotWords : vosk Ignoring word missing in vocabulary

I am trying to use vosk as a streaming ASR with new vocabulary but it not worked as expected (in my definition of hotwords).
If I create word liste with : ["Docteur Vinceneux"] and pass the json dump to KaldiRecongnizer; i get "docteur" only when I say "je veux parler au docteur vinceneux".
So first of all, all word that not par of the list a ignored during graph search... so I can't use it to transcribe phrases...
Second, for "Vinceneux" the logs said "vosk Ignoring word missing in vocabulary". Of course this name is not the vocabulary..

So what can I do for improve my ASR in zero shot config?