amarker.qml

import QtQuick 2.0
import QtQuick.Controls 2.0
import QtLocation 5.3

MapQuickItem {
    id: marker
    anchorPoint.x: marker.width / 4
    anchorPoint.y: marker.height
    property string labelText

    sourceItem: Item
    {
        Image {
            id: icon
            source: "qrc:/marker.png"
            sourceSize.width: 50
            sourceSize.height: 50
        }

        Rectangle {
            id: tag
            anchors.centerIn: label
            width: label.width + 4
            height: label.height + 2
            color: "black"
        }

        Label {
            id: label
            anchors.centerIn: parent
            anchors.horizontalCenterOffset: 20
            anchors.verticalCenterOffset: -12
            font.pixelSize: 16
            text: labelText
            color: "white"
        }
    }

}