Tag to pass parameters:
<script type="text/javascript">
  if ('yaCounter18831583' in window) {
    yaCounter18831583.params({
      custom: {
          checkin: {{checkInISODate}},
          checkout: {{checkOutISODate}},
          destinationId: {{pathId}},
          destinationName: {{pathName}},
          standardDateRange: {{isStandardDateRange}},
          guestCount: {{guestCount}},
          stars: {{starCategory}},
          daysToDeparture: {{daysToCheckIn}},
          stayLength: {{lengthOfStay}},
          rating: {{ratingCategory}},
          roomType: {{roomTypeName}},
          iGeoDistanceItem: {{itemId}},
          destinationConcept: {{destinationConcept}},
          }
    });
  }
window.dataLayer.push({ "ecommerce": {
        "detail": {
        "products": [
                {
                    "id": {{itemId}}
                },
            ]
        }
    }
 });
</script>