Separate email addresses from separate domains?

Hello, 

I have two different SS domains: michellemoses.com and michellewoodward.com. I have an email linked to michellemoses.com which is hello@michellemoses.com.  This is connected to Google Workspace on my SS account. But I also want to have an email address named hello@michellewoodward.com connected to my michellewoodward.com domain. But I don't see how I can do that on SS. I need help, please, so I can create a new email address linked to an existing but different domain.

Thanks for your help.