How to assign "Assign to" in Customer doctype via API

I’m looking for the way assigning “Assign to” via REST api in doctype of Customer.

I’m working with Frapperclient library
(https://github.com/frappe/frappe-client/blob/master/frappeclient/frappeclient.py)
And also searched google to find a way.
However, can’t find the way…

Please… Let me know the way assigning “Assign to” via REST api in doctype of Customer.

Problem is solved!!!

Just added function in frappeclient.py like this:

def assign_to(self, assign_to, doctype, name, description):
return self.post_request({
“cmd”: “frappe.desk.form.assign_to.add”,
“assign_to”: assign_to,
“doctype”: doctype,
“name”: name,
“description”: description
})