GetWorkItemIconJson.
        [Preview API] Get a work item icon given the friendly name and icon color.
        :param str icon: The name of the icon
        :param str color: The 6-digit hex color for the icon
        :param int v: The version of the icon (used only for cache invalidation)
        :rtype: :class:`<WorkItemIcon> <azure.devops.v5_0.work_item_tracking.models.WorkItemIcon>`

def get_work_item_icon_json(self, icon, color=None, v=None):
        """GetWorkItemIconJson.
        [Preview API] Get a work item icon given the friendly name and icon color.
        :param str icon: The name of the icon
        :param str color: The 6-digit hex color for the icon
        :param int v: The version of the icon (used only for cache invalidation)
        :rtype: :class:`<WorkItemIcon> <azure.devops.v5_0.work_item_tracking.models.WorkItemIcon>`
        """
        route_values = {}
        if icon is not None:
            route_values['icon'] = self._serialize.url('icon', icon, 'str')
        query_parameters = {}
        if color is not None:
            query_parameters['color'] = self._serialize.query('color', color, 'str')
        if v is not None:
            query_parameters['v'] = self._serialize.query('v', v, 'int')
        response = self._send(http_method='GET',
                              location_id='4e1eb4a5-1970-4228-a682-ec48eb2dca30',
                              version='5.0-preview.1',
                              route_values=route_values,
                              query_parameters=query_parameters)
        return self._deserialize('WorkItemIcon', response)