I use a username and password to log into GOG. I think my account was created before it supported Google SSO.
Now I'd like to use Google to sign into my GOG account, if that's possible.

Is there a way to link my Google account to my existing GOG account, so I can sign in with Google instead of my username and password?

Now of all times?
Why would you want that feature when trust of Google is at an all time low?

Gotta feed that machine I suppose. :/

The less that's linked to google the better.

Punk rock ethos aside, I already have a Google account, and using it for single sign-on is very convenient.
My #1 preference would be that GOG and every other site supports Passkey authentication, but that could be a while. I know they have Google SSO support already, so I'm wondering if I can use it with my account.