I'm new to odoo, currently I'm trying to adding a data filter in account_report module, and it made me to modify the js file in odoo (which is I'm not well versed). I've tried to modify the source code js and it worked, but I didn't allowed to modify the source code, so I had to inherit or override the js from a custom module. But I kept having trouble to access the data member or the class (I'm not really sure what it is) because part of my code need to declare that class/data member from the parent/included class, can u guys guide me how to access or get the class/data member? thanks in advance

here is my Code:

odoo.define('nrs_de_financial_report_currency.account_report', function (require) {
'use strict';
    var account_report = require('account_reports.account_report');
    var core = require('web.core');
    var datepicker = require('web.datepicker');
    var QWeb = core.qweb;
    var _t = core._t;

    account_report.include({
        unfold: function(line) {
            var self = this;            
            var parent_result = this._super.apply(this, arguments);
            var line_id = line.data('id');
            .
            .
            .
        render_searchview_buttons: function() {
            var self = this;
            // bind searchview buttons/filter to the correct actions
            var $datetimepickers = this.$searchview_buttons.find('.js_account_reports_datetimepicker');
            .
            .
            .
                   

                if (!_.isEmpty(fields)) {
                        //this is the trouble part, when I must declare the new M2MFilters
                        this.M2MFilters = new M2MFilters(this, fields);
                        this.M2MFilters.appendTo(this.$searchview_buttons.find('.js_account_partner_m2m'));
                    }
                } else {
                    this.$searchview_buttons.find('.js_account_partner_m2m').append(this.M2MFilters.$el);
                }