I need to have current cursor position in TinyMCE Oracle Apex. I use this js code for another type of page items and it work correctly.

var curPos = document.getElementById("P7_TEXT").selectionStart;
but when "P7_TEXT" is a Rich Text Editor (TinyMCE) , it will return "undefined"

what can I do to get the current position of cursor in rich text page item?

APEX version is 23.1.

const tinymceEditor = apex.items.P1_RTE.getEditor();
// getting the range
const range = tinymceEditor.selection.getRng();
// setting the range
tinymceEditor.selection.setRng( range );