Dmx-show or hide inside map marker info param

Trying to show info based on if the query returns a value in a google map with dynamic markers. Does not seems to work though. Please check my syntax and let me know if it is incorrect:

marker-info="'<span dmx-show=&quot;' + Ename + '&quot;>' + Ename + '<br/></span>' + full + '<span dmx-show=&quot;' + rating + '&quot;><br>' + rating + '</span> + <span dmx-hide=&quot;' + rating + '&quot;>Not rated yet</span>'"