Frappe javascript override class variable

Frappe Framework Custom Script
, ,
1

I have class with variables, I want change variable value by another function in external file

Class code

frappe.ui.Notifications = class Notifications {
    constructor() {
        frappe.model
            .with_doc('Notification Settings', frappe.session.user)
            .then(doc => {
                this.notifications_settings = doc;
                this.make();
            });
    }

    make() {
        this.$dropdown = $('.navbar').find('.dropdown-notifications');
        this.$dropdown_list = this.$dropdown.find('.notifications-list');
        this.$notification_indicator = this.$dropdown.find('.notifications-indicator');
    }
};

i wand change variable this.$dropdown

frappe.ui.Notifications.$dropdown =  $('.Header').find('.dropdown-item-notifications');
2

Any answers or solution ?