Hi Anthony 

Thanks for posting in the community! To clarify are you referring to the specific syntax used in the markup for the UI context menu shape? If so at this time we do not have a help center article detailing the markup but our content team works rigorously to make improvements to our knowledge base and they are aware of the need for this article. As an additional resource you may find the guidance provided here helpful when creating your mockup. Please let me know if you have any additional questions!