We did it for our rescue thru Maine Lab Rescue in 2017. Her appearance is all/most yellow Lab, has the webbed feet, short somewhat coarse coat (less inner hair than the purebred black Lab we enjoyed 2003-16) and general body form of a Lab. She also has the pink nose and white blaze on the back of her neck that describes a "Dudley Lab". However, the DNA results had her with 1/8 each of 4 different breeds, Lab being one but another was Corgi(?) and while I don't recall the other 2, I do remember they were nothing like a Lab. The other 1/2 was listed as "mixed", so we learned essentially nothing.
Despite the Lab appearance she doesn't particularly like water (Abby the black Lab was unable to walk past it without a wallow - at any temp) and "retriever" is not part of her character. However, the Lab personality is all there, enthusiasm, friendliness, tolerant of kids, cats and most everything else.