There is no native way to define placeholder for a text input (and others) editor in tables.
It would be nice to have it.
Actually I need a specific editor for that :
webix.editors.text_with_placeholder = webix.extend(
{
render: function () {
const elem = webix.editors.text.render.apply(this, arguments);
elem.firstChild.setAttribute('placeholder', this.config.placeholder);
return elem;
},
},
webix.editors.text,
);