Include google map link

Hi all. I work with google map on my site and need help.Ho to correctly include

    <script async defer
         src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAwYULi8da91JX86vVBeAh_ApKzcHYRxsQ&callback=initialize">
 </script>

into project via do assets.addJs. The problem is that the borwser doesnt see "async defer". I tried so, but didnt work.

		    {% do assets.addJs('https://maps.googleapis.com/maps/api/js?key=AIzaSyAwYULi8da91JX86vVBeAh_ApKzcHYRxsQ&callback=initialize',{'loading':'async'}) %}

Please help.Thanks before

I tested this and it totally works:

{% do assets.addJs('https://maps.googleapis.com/maps/api/js?key=AIzaSyAwYULi8da91JX86vVBeAh_ApKzcHYRxsQ&callback=initialize',{'loading':'async defer'}) %}

I get:

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAwYULi8da91JX86vVBeAh_ApKzcHYRxsQ&callback=initialize" type="text/javascript" async defer></script>

@rhukster thanks!