Using REST API insert to subform !

Using REST API insert to subform !

i have a main form call as Employee in this form has subform with Name: Employee Adress is a Subform fo Adress
now i using REST API

...................

<input type="text" name="Employee Adress[City]" value=""/>

but did not work !

so how to format a subform data to work with ReST APi

thanks for support !