Recently, I have been working with a colleague to verify a domain in G Suite, As you know without a custom domain you can’t do much in G Suite.
They didn’t want to go with automatic sign in option, which creates necessary txt automatically, and as you know it won’t be feasible in Corporate Environment because the Teams managing G Suite may not have credentials of DNS Provider.
I looked into multiple options but there was no way to get option of txt record, so we contacted Google Support and they gave us this url.
Now, you have txt record, you can add that to your DNS Provider and you are ready to go !
Thank you for reading and be safe !