Additional fields : Need to display a specific info on the map? Create additional fields! Additional fields are custom fields specifically designed to be displayed on the map. Let’s say your map is about coffeshops and you want to show the opening hours and the name of the nearest subway station? Create 2 additional fields : openingHours and nearestSubway.
but Additional fields this is simple text field if you need more functionality you need use additional field tags
Additional tags support any php code and any shortcode
1 Create additional fields

2 fill in the fields in the Marker settings

3 Those informations are ready to be displayed in the marker list and the tooltips.

4 You can see this fields on map