Adding Review Company Not Currently Integrated With

It would be a nice feature that when we are manually uplaoding testimonials that are not from a big review collection company like google or Yelp if we could create the smalle company on our own. I.E. I use a company that collects phone reviews and emails me the transcript. I would like to add their logo to the review like the GMB or Yelp logo as the “platform” not the customer. That way it adds credability of where it was collected.