Problem at exporting diagrams as pdf

Hi guys,
when i export my diagrams as pdf,the elements which contains Persian Characters in their name, wont show this characters.
like this :
a

I also change encoding to unicode but the Persian phrases will corrupt and wont show properly .
like this :

I guess you need to add UTF-8 encoding to support Persian characters too.
thank you in advance

During export PDF, you need select font in order to show Persian characters.

Remind that, the specific font will be embedded in exported PDF.
Please make sure you have license of that font.

Hope it help.