[NTG-context] \vtop with middle alignment in a screenplay

Hi all, I'm trying to make a simple template for screenplays for our amateur theatre. I have following code and I'd like to have the single lines of the song centered in a page, but preceded by a person name on the left {Person 1: \setupalign[middle]{\vtop{% song asdf line 1\\ song line 2\\ song a line 3}}} This code obviously does not work as I need. Can please someone advice me proper ConTeXt way how to do it? many thanks Jan