Hey Jessie,
As you mentioned, Google has guidelines against marking up 3rd Party Reviews with schema for the LocalBusiness and Organization types. If you scroll down to the technical guidelines section, you’ll see the following:
“Sites must collect ratings information directly from users and not from other sites.”
You can also see the potential penalty for not complying with these guidelines on that page:
Warning: If your site violates one or more of these guidelines, then Google may take manual action against it.
As to comply with Google’s best practices, our widget does not support marking up third-party reviews with schema.
Best,
Jesse