angularjs-dropdown-multiselect with dynamic button text

http://dotansimha.github.io/angularjs-dropdown-multiselect/#/ Smart Button Text

HTML

<script src="https://rawgit.com/dotansimha/angularjs-dropdown-multiselect/master/src/angularjs-dropdown-multiselect.js"></script>
<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.0/lodash.js"></script>
<link rel="stylesheet" href="https://bootswatch.com/slate/bootstrap.css">
<div ng-app="exampleApp" ng-controller="appController">


     <select class="form-control" ng-model="disabledOptions">
        <option
            ng-repeat="fruit in example13data"
            ng-value="fruit.label"
        >{{fruit.label}}</option>
    </select>
    <br><br>

      <select class="form-control" multiple ng-model="disabledOptions1">
        <option
            ng-repeat="fruit in example13data"
            ng-disabled="disabledOptions.indexOf(fruit.label) !== -1"
            ng-value="fruit.label"
        >{{fruit.label}}</option>
    </select>
   
</div>

JavaScript

var myApp = angular.module('exampleApp',['angularjs-dropdown-multiselect']);

myApp.controller('appController', ['$scope', function($scope) {
    
        $scope.example13model = [];
        $scope.example13data = [
            {id: 1, label: "David"},
            {id: 2, label: "Jhon"},
            {id: 3, label: "Lisa"},
            {id: 4, label: "Nicole"},
            {id: 5, label: "Danny"}];
        
        $scope.disabledOptions = ['David'];
        $scope.disabledOptions1 = $scope.example13data[0];

}]);