在 Yandex.Maps 中用您自己的标签替换标准标签

大家好。有一个地图，设置了标签，但是如何用你自己的替换标准标签？如果标签的坐标取自 json 文件，并且在文档本身中，标签设置为坐标，而不是替换 (

function init() {
    var myMap = new ymaps.Map('msk_map',{
        center: [55.7, 37.5],
        zoom: 9,
        controls: ['zoomControl']
    }),
    // Создаем коллекцию.
    myCollection = new ymaps.GeoObjectCollection();
    $.getJSON('js/data.json', function(data) {
        for (var i in data.departments) {
            myPoints = [{
                coords: 
                    [
                        data.departments[i].lat, data.departments[i].lon],
                text: data.departments[i].title
            }];              
            for (var i = 0, l = myPoints.length; i < l; i++) {
                var point = myPoints[i];
                console.log(point.coords)
                myCollection.add(new ymaps.Placemark(point.coords,{
                    iconLayout: "default#image",
                    iconImageHref: 'images/svg/officee/offices-citymap-POI.svg' ,
                    iconImageSize: [30, 38],
                    iconImageOffset: [-5, -38] ,
                    balloonContentBody: point.text
                }));
            }

            // Добавляем коллекцию меток на карту.
            myMap.geoObjects.add(myCollection);
        }


    });
};