const buildings = await COLLECTIONS.BUILDINGS.where('building', '==', 'tall').get();

buildings.forEach((doc) => {

                buildings.forEach((doc) => {
                    ????
                })
        

});

I've tried to use 'doc.set' to add a subcollection with some data to each document snapshot, but I get the error 'Property 'set' does not exist on type 'QueryDocumentSnapshot''

How do I add a subcollection with some data for each document?