<xsl:for-each-group
   select="//*/string-join(ancestor-or-self::*/name(), '/')"
   group-by=".">
       <xsl:sequence select="concat('&#xa;', ., ' - ', count(current-group()))"/>
 </xsl:for-each-group>

Except, if we change slightly the concat to following (please note a
starting '/'):
concat('
', '/', ., ' - ', count(current-group()))

--
Regards,
Mukul Gandhi