How can I check if an email address is linked to a "personal" or a "business" Google account?

How can I check if an email address is linked to a "personal" or a "business" Google account?

In other words, I need to know if a domain is registered for business use in Google or not.

I would like this to be a standalone method (i.e., I am not looking for an addon like Domain Checker, but rather to replicate what it does on my own).

Please note that I am looking for a method that can identify even if the domain is not using Google Workspace for email (unlike this question). Specifically, I know that I can check the MX records, but this does not cover cases when the domain is not using Gmail at all, or is not even live on Google but is already registered.