Visio Services Vwa.Shape.getShapeData returns only one object

I am using Visio Services on a SharePoint site in Office 365. I have configured the Visio Web Access WebPart to load a Visio drawing that has linked other pages on the same Visio file. I want to read the shape data out of a selected Visio shape. I therefore use the method getShapeData() from the Vwa.Shape class that returns an array of anonymous objects. Each anonymous object has a label- and value-property I need to access.

The array contains only one object where the label = "name" and the value = "The name of the shape". I miss all other shape data that are set in Visio (-> dev tools  -> shape sheet -> shape data).

How can I access all objects that Visio offers in the Shape Data element?

Thanks for a reply.

Thomas