You can modify item content in the listing using placeholders. Display extra fields using {extra_field_name} and custom fields using {%custom_fields_name%}.
How to use listing placeholder
Step 1: Go to Add or Edit Map and scroll down to the ‘Listing Settings’ section.
Step 2: Then add placeholders and Update Listing htnl editor input.
Step 3: Click on Save Map and open it in a browser.
You’ll see extra fields add in the listing.