InfoWindow lets you generate a Tooltip to display data directly above the Marker.
You can choose to render it from:
In Simple Mode, a text field or a selection of fields may appear. The type of map and query affect the appearance of these fields.
Dynamic HTML is an advanced way to display what you like using the Dynamic Shortcodes plugin.
Template
In the case of Query on CPT, the InfoWindow will show the Dynamic data of each single post.