Chatting about laundry facilities and meal times, Pam led us through an entryway jumble of backpacks and umbrellas. In the kitchen, she poured apple ( From an ACT test)
Please help me understand why nouns " jumble of backpacks and umbrellas" can directly post-modifies another noun " entryway". I think at least a preposition like "with" or others are needed here between "entryway" and " jumble of backpacks and umbrellas".