Using coordinates for a shape map

Hi Yuna.

I meant the shape map (it's a preview feature.) An example of how the shape map looks, and where Zentrum region is located, is here:

I got that from using the .json as a custom map in the shape map visual. Now I want to count (for example) how many rows are located in the Zentrum region using the coordinates, like this (visual made with a different software):

Bonus points if the sections of the map that do not have any observations could be cut away like in the example above!