You can export Google Ads using in5, simply by choosing the Google Ad output format in the export dialog.

Hyperlinks are automatically converted to valid clickTags.

You can use native InDesign animation, as well as the advanced features that in5 supports.

in5 will export a .zip that you can upload directly to the Google Ad HTML5 Validator, as well as to your Google Ads account (once approved to upload HTML5 ads).

See the video below for more details.

For additional techniques, and how to make an ad responsive, see this article on Creating a Web Banner.

Note that you can also create animated GIFs for ads, using InDesign and in5.