Как в wp.editor добавить плейсхолдер?

tinymce.js 4.9.10 так не получилось placeholder: "Ask a question or post an update...",

wp.editor.initialize(
            editor_id,
            {
                    tinymce: {
                      wpautop: true,
                        placeholder: "Ask a question or post an update...",
                        plugins : 'charmap colorpicker compat3x directionality hr image lists media paste tabfocus textcolor wordpress wpautoresize wpdialogs wpeditimage wpemoji wpgallery wplink wptextpattern wpview',
                        toolbar1: 'bold italic underline strikethrough | link unlink | fullscreen |formatselect forecolor | image',
 
                    },
                mediaButtons: true,
                }
            );