It's called BIMI (Brand Indicators for Message Identification) and it's relatively new (2020). Google was only letting certain websites into their pilot program, but now it looks as if it's open to everyone. I'm in the process of testing it now. I'll update this post later once I see if it works. Here's info about what it is and how to implement it.
Implementation Guide:
https://bimigroup.org/implementation-guide/
More Info:
https://knowledge.hubspot.com/email/use-bimi-to-display-your-verified-brand-logo-in-emails
