I am working with Odoo 14 Community, with the purchase, sale and inventory modules, I configured the system with a Dropshipping route

I am trying to modify the printing of the purchase orders from the report_purchaseorder_document view, to add the customer's phone and mobile as an element in the Shipping Address

For this I am trying to add a line in the structure, but I don't know which variable contains the customer's phone and mobile numbers

    ...
        < t t-if="o.dest_address_id" >
            < t t-set="information_block" >
                < strong>Shipping address:< /strong >
                < div t-if="o.dest_address_id" >

                    Phone: < span t-field="CUSTOMER-PHONE-VARIABLE"/ >

                    < div t-field="o.dest_address_id" t-options="{& quot;widget& quot;: & quot;contact& quot;, & quot;fields& quot;: [& quot;email& quot;, & quot;address& quot;, & quot;name& quot;, & quot;phone& quot;], & quot;no_marker& quot;: True, & quot;phone_icons& quot;: True}" name="purchase_shipping_address"/ >
                < /div >
            < /t >
        < /t >
...

Could you help me identify the name of this variable

Thanks