Add a additionnal template into initTarteAuCitron.xsl :
<xsl:template name="head-js-grpd" > <xsl:call-template name="head-js-grpd-wrapper" /> </xsl:template> <xsl:template name="head-js-grpd-wrapper" > <xsl:param name="configuration">{}</xsl:param> ... </xsl:template>
To will be able to override them with only :
<xsl:template name="head-js-grpd"> <xsl:call-template name="head-js-grpd-wrapper"> <xsl:with-param name="configuration">{\"orientation\": \"bottom\",}</xsl:with-param> </xsl:call-template> </xsl:template>