While shapes are supported on Excel and PowerPoint Office.JS API, it's not the case of the Word API. Please allow us to: Create a new shape Edit the shape color and add a background image Add ...
I was amazed to see that this is not supported YET, when both PowerPoint and Excel support this feature. MS, plz make this a priority. Or if it is going to take time, plz provide a sample in ScriptLab on how to achieve this through OOXML.