TinyMCE – Add button that changes direction of selected text

Ok, I am going to create website in Urdu(rtl) & English(ltr) language that contain paragraphs like this:

<p style="direction:rtl">کیا حال ہے buddy? سب خیریت ہے؟</p>

You can see that sentence in not showing correctly. I want to change the direction of English words in sentense. like this:

<p style="direction:rtl">کیا حال ہے <bdo dir="ltr">buddy?</bdo> سب خیریت ہے؟</p>

You can see more clear differance at JSfiddle. How it is possible? Any idea?

Maybe this can help you, it adds the buttons and from the screenshot it looks like it is possible to achieve what you want: https://wordpress.org/plugins/wp-rtl/