How can i add Get items from Button on a doctype

ERPNext
1

I want to add Get items from button to Issue doctype and i want to get items from the same docype

2 
    get_items:(frm)=>{
        frappe.show_progress('Getting Items', 10, 100)
        
        frappe.call({ method:"frappe.client.get_list",
		args:{
			doctype: "Items",
			fields: ["name"],
			filters:[
				["brand","=","my_brand"],
			],
			limit_page_length: 100
		},
    		callback: function(res){ 
                frm.clear_table('my_childtable')
                res.message.forEach((item)=>{
                    frm.add_child('my_childtable', {
                        childtable_field: item.name,
                    });
                })
                frm.refresh_field('my_childtable')
                frappe.show_progress('Getting Items', 100, 100,'',true)
            }
        });
    }

Check this out. Here, I’m using a button inside the form view. However, if you’re using the button, make sure the function code follows a similar structure