I just want to add persian and arabic calendar, how can I do that?

Sorry, we don't have experience with mentioned calendar.

Microsoft created it's class many years ago in .net framework:

https://docs.microsoft.com/en-us/dotnet/api/system.globalization.persiancalendar?view=netframework-4.8

I just want to know can I handle it with write a plugin? If yes, how? And if not, is there any other way for this?

Mostly each part of GrandNode can be customized by plugin. So probably it's possible, but sometimes it's not efficient to override some parts, due to ammount of time and task complexity to achieve that.