How can I import an external script src in angular.json?

Question

I have an external script that I want to add in my Angular 6 project

https://maps.googleapis.com/maps/api/js?key=KEY

I know I can import this in the script tag in my index.html

<script src="https://maps.googleapis.com/maps/api/jskey=KEY"></script>

But I was wondering if there is a much cleaner way to do this? Such as importing from angular.json in the scripts section.