Problem:
Currently, not all styles available in the Captivate GUI can be set via the button’s designOption.json.
Examples: gradient in shapeData, inner/outer shadows including position, and certain icon settings do not apply.

Suggestion:
Extend the button’s designOption.json, so that all styles available in the GUI can be applied.
Additionally, as with content_blocks and smart_widgets, the JSON for buttons should be extended with customStyles.