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That is not possible. But you know that you get the number of favorite points by clicking on each cache.
Have you tried https://project-gc.com/Statistics/TopFav and using all filters and especially Center/radius (km). With this you reduce the number of caches and get a list (ranked) of all caches with FP. THEN you can create a map with these filtered caches and choose how many of these you want to show on a map.
So you get a map with the most FP caches in an area of interest.