Graph level classification using structural features in pytorch gyometric

I’m very new to GNN and graphs. I want to do a graph level classification using pytorch gyometric and I’m very confused. In fact, I want only to use the structural features of the nodes to do classification and there is no attribute features for nodes. Is it possible to do graph level classification based on topological structure only? If so, what is the best way to do that? my graphs have 24 nodes, so not large graphs. thank you!