We don't currently have built-in means to serialize a scene graph. It's easy to see how this feature can be very useful.
Each drawing element has a "nodeType" field and an "options" configuration object.
Serializing a shape tree with these fields should be sufficient.
Please, file a feature request on our UserVoice portal
if you have a minute.
This will help us gauge the overall interest and prioritize.
Telerik by Progress