The Chinese full-text searches are only searching characters, not readings. So there'd be no difference between a "Chinese Full (Chinese Dictionaries)" and a "Cantonese Full (Chinese Dictionaries)" for example.
You could create a search profile that was limited to a specific subset of dictionaries, but I don't know if we could offer a built-in dictionary collection for "Cantonese" because I think people might differ in which dictionaries they considered Cantonese; a Mandarin dictionary with Cantonese readings like PLC might have some utility for written Cantonese, e.g., but it wouldn't cover Cantonese slang.