Please have a look at this forums thread, which deals with POI clustering and should give you an idea on how to create such clusters.
about 7 years ago
does anyone know how i can put multiple overlapping POIs in the Architect view in a kind of Folder structure. So if I touch the Folder it opens/expands and all POIs inside become visible without overlapping ?
I think there is such a function in the Wikitude App.