makit CombinationChart in xml

Hello,

I tried to define a makit combination chart in an xml view.

I can define a normal row or column chart in xml but once I add the layers tag I get the error:

Uncaught Error: Cannot add direct child without default aggregation defined for control sap.makit.Chart

I am assuming this means 'layers' is not a valid tag.

Is it even possible to create the combination chart entirely in xml?

Thank you in advance

Johannes