Zoho create contact doesn’t have option to map GST

I was actually trying to connect Razorpay and zohobooks to create invoices. What I found missing was in create contact in Zoho books option there is no option to map GST details? Can anybody help
 
As you can see in the S1 below i have captured the GST details while collecting payment on Razorpay but when I am creating a new contact in Zoho Books there is no option to pass the GST Number to zoho books.
 

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