Bold Style is missing for Arabic text in PDF output of rtf template

Summary: We have a check template (.rtf) developed with Payment Date, Payee Name, Payment Amount and Payment Amount in Words .

In these fields, Payee name and Payment Amount in Words are in Arabic Language. Client is expecting all fields should be printed on check in Bold style. when I apply Bold Style to all fields and see the PDF output format, Bold style is missing for Arabic text but, other fields like payment date and amount are showing in bold.

i have added English text in the template for testing purpose and applied Bold style, it is showing fine for English text. Problem is with Arabic text only.