Can you set async defer when using {% includeJsFile %}? Is there a way to set async defer on a &lt;script&gt; tag with the built in: 

{% includeJsFile %}


It's for Google Maps e.g.: 

&lt;script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&amp;callback=initMap"
async defer&gt;&lt;/script&gt;


I'd still like to be able to output this at the bottom of the layout from within another template. Is this possible?
As of Craft 3 (Tested using RC5) you can do it like this: 

{% do view.registerJsFile("path/to/script.js", {"async":"async", "defer":"defer"}) %}


Source: Documentation for Yii's view.registerJsFile()