How to concatenate a string with Goolge maps it

I am trying to add a link in the popup window in google maps. I’ve done it before with the old school DMXzone stuff, but have question on how to add the link?

<dmx-google-maps id="maps1" maptype-control="true" latitude="38.1811509" longitude="-92.6347405" zoom="4" height="600" dmx-bind:markers="conn_dealerQry.data.query1" marker-latitude="lat" marker-longitude="lon" zoom-control="true" marker-id="dealer_id" marker-title="dealer" marker-info="{{dealer}}<br>{{address}}<br>{{city}}, {{state}}, {{zip}}<br>{{phone}}<br><br>[ Click For More Details ]"></dmx-google-maps>

I need to add <a href="link to someplace">[ click for more details ]</a> to the script. Not sure if I need to do an asp & to concatenate the string or + or what? Anyone have any ideas?

thanks