Can I put arbitrary properties on any SAP HANA Graph DB node or edge?

In our project we're planning to use SAP HANA Graph DB. It seems that it's possible to have properties/attributes on the nodes and edges, but they should be defined in the corresponding tables. That means, every time I need to put a new (type of) property on a certain edge/node, I need to change the schema of the underlying tables. It's preferable for me to not have to do this. Other graph engines (e.g. - Apache Jena) allow this (by adding a property as a triple or another way). Am I missing something? Is it possible with HANA too?