Apply link filter based on default value in Script Report

Frappe Framework Customization
,
1

I have created a script report in which i have added filter in .js file as below:

> frappe.query_reports["Internal Voucher"] = {
> 	    "filters": [		
> 		{
>             "fieldname":"customer",
>             "label": __("Customer"),
>             "fieldtype": "Link",
>             "options": "Customer",
> 			"get_query": function() {
> 				return {
> 					"doctype": "Customer",
> 					"filters": {
> 						"customer_group": "Internal Customer",
> 					}
> 				}
> 			}
> 		},
> 	]
> }

I was trying to get a list of customer based on customer_group = “Internal Customer” but it’s not working. Instead, above filter shows all customer instead of list of customer where customer_group = “Internal Customer”.

How could i set user defined value in link filter in custom report?