How can I add tinymce editor in WordPress with jQuery?

This is a good use case for the JS version of the editor introduced in 4.8: https://make.wordpress.org/core/2017/05/20/editor-api-changes-in-4-8/

A new editor API was added in #35760. It makes it possible to
dynamically instantiate the editor from JS.

Here’s an example of how it’s used (stolen from Rheinard Korf’s example here):

// Remember to wp_enqueue_editor(); inside PHP.

// Add editor
wp.editor.initialize(
  'test-editor',
  { 
    tinymce: { 
      wpautop:true, 
      plugins : 'charmap colorpicker compat3x directionality fullscreen hr image lists media paste tabfocus textcolor wordpress wpautoresize wpdialogs wpeditimage wpemoji wpgallery wplink wptextpattern wpview', 
      toolbar1: 'formatselect bold italic | bullist numlist | blockquote | alignleft aligncenter alignright | link unlink | wp_more | spellchecker' 
    }, 
    quicktags: true 
  }
);

Where test-editor would be the ID of the textarea you want to make an editor.