class ProductCategoryReport(models.TransientModel):
    _name = 'product.category.wizard'

    _description = "Print Product Category Report"

    date_from = fields.Datetime('From', default=lambda self: fields.datetime.now(), required=True)
    date_to = fields.Datetime('To', default=lambda self: fields.datetime.now(), required=True)
    categ_ids = fields.Many2many('product.category', copy=False)

    def check_date(self, date_from, date_to):
        today = fields.datetime.now()
        if date_from > today:
            raise UserError('You could not set the start date or the end date in the future.')
        else:
            return True
        
    def action_report(self):
        check_date = self.check_date(self.date_from, self.date_to)
        data = {
            'form_data': self.read()[0],
        }
        if check_date:
            if data['form_data']['categ_ids']:
                selected_products = data['form_data']['categ_ids']
                products = self.env['product.template'].search([('categ_id', '=', selected_products)])
                # order_date = self.env['purchase.order'].search([('date_order', '=', selected_products)])
            else:
                products = self.env['product.template'].search([])
            product_list = []
            for app in products:
                vals = {
                    'categ_id': app.categ_id.name,
                    'id': app.id,
                    'name': app.name,
                    'qty_available': app.qty_available,
                    'uom_id': app.uom_id.name,
                    'standard_price': app.standard_price,
                    'create_date': app.create_date,
                    'item_code': app.item_code,
                }
                product_list.append(vals)
            data['products'] = product_list
            return self.env.ref('product_category_list_report.action_product_category_report').report_action(self, data)

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here i want to show product category wise example:
category1
product1
product2
category2
product1
product2
category3
product1
product2