Hi Hiromi,
Thanks for getting back to us.
Yes, it's currently not possible to migrate your image extensions to Assets,
but that functionality is on the horizon. For now, you may keep an eye on our
blog for announcements and updates.
Let us know if you have any further questions.
Regards,
Hi Hiromi,
Image asset-based extensions currently aren't on the list of API supported
asset extensions. More asset based based extensions will be supported in the
API soon.
Regards,
Aryeh Baker
Google Ads API Team
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