right and left hyphen

basic_format_and_style_settings.ly

@@ -147,4 +147,15 @@ repStopWithTag = \lyricmode {
     \once \override StanzaNumber.direction = 1
     \set stanza = \markup { \repStop }
   }
+}
+
+rightHyphen = \lyricmode {
+  \once \override StanzaNumber.font-series = #'normal
+  \once \override StanzaNumber.direction = 1
+  \set stanza = "-"
+}
+
+leftHyphen = \lyricmode {
+  \once \override StanzaNumber.font-series = #'normal
+  \set stanza = "-"
 }