[kemayo]

The Google Domains page has a claim of "chat, phone and email support" which links to: https://domains.google.com/registrar#contactus&chp=contactus

I haven't actually tried following through with it, since I don't have any support queries myself, but that certainly /looks/ like a way to directly talk to support.

[beowulfey]

I can confirm that the contact us does connect you to support; usually Google provides at least adequate support options for paid services (e.g., Domains). I spoke with someone over Chat that was surprisingly knowledgeable, and even gave me the heads up that the new features would be rolling out soon (this was a couple weeks ago)