Hi archi98, 

It is not possible to complete this for a few reasons. 

1. To do so would require "amenity=university" tagging to be applied. This is only applied to the main/major campus grounds i.e. this building is not the university, but rather a separated part of it.
2. Its also not clear from the imagery where the grounds begin and end. 
3. How you have mapped it already, with a node and operator as WIT works for regular search queries