Change stanza formatting

[David F.]

Given a line of lyrics with the stanza number in front, how can I move the 
stanza number (“1.”) so that it is above the first syllable of the lyrics 
instead of to the left of the lyrics?

\version "2.19"

\new Voice \relative {
    \time 3/4 g'2 e4 a2 f4 g2.
}
\addlyrics {
    \set stanza = #"1. "
    Hi, my name is Bert.
}

Thanks,
David