Read on Magnus Carlsen[0] and Josh Waitzkin[1] - both have top spots in other fields, (and I'm sure others do too, these are from memory). Either talent is less specific than you'd think, or work ethic is more important than you'd think.
I don't see this with Carlsen. Fantasy football? Well ... Waitzkin may be successful in martial arts but still that's the exception not the norm.
Also I would claim that talent is domain-specific insofar that very few people have a mental and a physical talent at the same time. For instance there are professional athletes who are very good in some other sport but I know of no one who is also very good at chess.
You may discard Fantasy Football, but it is not easy to be a top player - there are thousands of people who spend a few hours a day practicing, and have been for years. It’s been a while, but when Magnusen rose from “not playing”’to the top spot it was impressive and unusual.
Emanuel Lasker was iirc a very noted mathematician. As I mentioned, this is from memory. I’ve known a person who had both made the national swim team as a 19-year old, and was a national bridge champion in his thirties (not in the US).
I don’t know to separate talent from work ethics, but my layman’s impression is that that these aren’t simple, and definitely not independent, measures across fields.
[0] https://en.wikipedia.org/wiki/Magnus_Carlsen#Personal_life
[1] https://en.wikipedia.org/wiki/Joshua_Waitzkin#Martial_arts