Did anybody try to add an external reference to e.g. google maps api in open ui ? (not in iframe)

In open ui you can add a local reference to any javascript through the manifest files view.

But what if i want to add an external reference there, like the google maps api.

I know the iframe solution, where you create a DOM with a reference to google maps in the header of this sub-document, but as far as I can see, you can not acces the PM or PR there, making the integration only 1 way.

Did anybody try adding the manifest file as an external reference to :

https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false

with success ?