Google this week announced expanded support for AMPHTML creatives in DV360 over the next few weeks.
Image creatives will auto-convert for AMP inventory, and AMPHTML creatives will soon be able to serve across more inventory, including non-AMP pages.
Google says If an image creative serves on AMP inventory, it will be auto-converted into an AMPHTML creative in order to render quickly and correctly on the page.
As of January this year, 12% of all display ads were AMP ads.