How can I import custom fields from another CRM (zoho account registered on another domain)?

How can I import custom fields from another CRM (zoho account registered on another domain)?

I have created multiple custom fields (~50 fields) with dependencies and mapping from my Zoho account (account A). I want to import all the data, and also custom fields, to my other account (account B).

What is the right way to do that? And if it is not supported yet what is the work around to get the task done?