Copy the Order Lines list into a simple text to a custom notebook (tab) in Odoo 13 CE

Question

I got stuck to this customization for weeks. I'm using Odoo 13 CE.

I wanted to copy the Order Lines list into a simple text to a custom notebook (tab) in Odoo.

From this:

To This:

What I did were making the related fields & custom views.

py file:

from odoo import models, fields
class SaleOrder(models.Model):
_inherit = 'sale.order'

partner_id_wa = fields.Many2one(related='partner_id')
phone_wa = fields.Char(related='phone')
amount_total_wa = fields.Monetary(related='amount_total')
order_line_wa = fields.One2many(related='order_line')
order_line_waa = fields.One2many('sale.order.line', 'name', 'Order Lines', related='order_line')
product_id_wa = fields.Many2one(related='order_line.product_id')
product_uom_qty_wa = fields.Float(related='order_line.product_uom_qty')
price_subtotal_wa = fields.Monetary(related='order_line.price_subtotal')

xml file:

               <notebook position="inside">
               <page string="Special Notes">
                <label for="special_notes_1" string="Special Notes"/>
                 <div class="o_specnotes_format border">
                    <field name="special_notes_1" placeholder="Header: Dear,..." class="o_specnotes_sn1"/>
                    <br></br>
                    <field name="special_notes_2" placeholder="Body: Happy Birthday..." class="o_specnotes_sn2"/>
                    <br></br>
                    <field name="special_notes_3" placeholder="Footer: Sincerely,..." class="o_specnotes_sn3"/>
                 </div>
               </page>
               <page string = "Invoice WA">
                  <div>
                   <field name="partner_id_wa" options="{'no_open': True}" readonly="1"/>
                   <br></br>
                   <field name="phone_wa" readonly="1"></field>
                   <br></br>
                   <field name="product_id_wa"/> - <field name="product_uom_qty_wa"/>: <field name="price_subtotal_wa"/>
                   <br></br>
                   <field name="amount_total_wa"></field>
                  </div>
               </page>
           </notebook>

It turned out showing only the first line of the order line, not all (Invoice WA tab).

Is there any other approach to do this better? How to correct it? Thanks!