Menu json format how to set userdata

Dear sir,
any one can teach me, how to set userdata, when i use dhtmlxMenu at json format?

Hi

here is a demo dhtmlx.com/docs/products/dhtmlxM … attrs.html
and it use a json file dhtmlx.com/docs/products/dhtmlxM … items.json

you can try in console
myMenuJSON.getUserData(“open”, “my_data_name”);
myMenuJSON.getUserData(“open”, “more_info”);