Optionalbutton?: {Optionalicon?: stringGoogle icon name
Optionallabel?: stringOptionalonclick?: stringcurrently only URLs are supported
Optionalpriority?: numberLow priority is icon is on the left, high priority is icon is on the right. Default is 0
Optionaltarget?: "_blank" | "_self" | "_parent" | "_top"
This is the model for the postMessage event that the needle engine will send to create menu items