Is it permitted by the fiverr to put personal contact information like Email Address, ■■■■■ ID, Whatsapp No. etc. in the Conversion with Employers as in response of Buyer’s Request?
Not unless it’s pertinent to the job they’re requesting.
I think you mean buyers instead of employers.
Personal information is not allowed to be shared.
Suggest you read the Terms of Service at the bottom of the Fiverr main page for the rules as to how Fiverr works as a violation can risk your account.