Since I am of course using JOSM, I draw the soccer fields as long as the left goal and the right goal are on these recreation grounds / parks.
Since I am only relying on the aerial images from 'bing' here, I can only vaguely use a narrow side from top to bottom with the help of the tool for buildings, since no boundary is apparent.
Better than nothing, as in some corners nothing happened for years.
In my experience in another country, when 'bing' updates the aerial photos at certain intervals, I noticed that there was an inaccuracy.
In other words, if official real estate maps with buildings and local aerial photographs were available on a 1:1 basis, then we would be closer to reality.
Regards

Translated with www.DeepL.com/Translator (free version)