Can we able to change the fieldname using js for each row in child table?

allow_bulk_edit: 0
​
allow_in_quick_entry: 0
​
allow_on_submit: 0
​
bold: 0
​
collapsible: 0
​
colsize: 1
​
columns: 1
​
creation: "2023-11-16 17:06:05.067305"
​
docstatus: 0
​
doctype: "DocField"
​
fetch_if_empty: 0
​
fieldname: "variant_1"
​
fieldtype: "Select"

Here I have to change the fieldname as variant, it should be permanent
eg: fieldname: “Grade”