How to Show standard price list of item along with selected selling price_price list in print format of sales invoice

Frappe Framework Print Formats
1

Objective
There are Multiple Price lists for various customers, example wholesale , wholesale max , Agent along with the normal standard selling price list -
I need for special customers to see what price they have got along side the standard rate ,
eg. for agents the selling price is lower for all items and stored in agent price list , when i print the invoice , i want it to show the actual price (standard price) and the price i am giving him .

Attempts
i have created a custom print format from the builder and put price list rate along with rate -
but i want somehow for the price list rate to fetch the standard price list no matter what price list is put only in the print format .

possible solutions
1 . somehow create a custom field in items table as standard price , and then just add it in the print format using the print builder .
but i dont know how to fetch the standard price of that item in that field
this is the easiest solution i can come up with –

how would one achieve it , or if there is any alternate better solution to acheive it ,

2

are calling data from a child table?
this is how i did it i have child table named item in my parent doctype

	{%- for item in doc.items -%}
	<tr class="lh2">
		<td>{{ loop.index }}</td>
		<td align="left"> {{ item.get_formatted("description") }}</td>
		<td align="center">{{ item.qty }} </td> 
		<td class="text-right"> {{ frappe.utils.fmt_money(item.get("rate"),currency="$") }}</td>
		<td class="text-right"> {{ frappe.utils.fmt_money(item.get("amount"),currency="$") }}</td>
	</tr>
	{%- endfor -%}
3

Unfortunately , the code above fetches the rate which is already there in the fields, while the objective is to always fetch a fixed rate and display that ,

4

I worked on a solution from my above option -
created a custom field called standard rate which will always fetch the standard selling rate no matter what price list is selected ,
below is the script to fetch it ,

        $.each(cur_frm.doc.items || [], function(i, v) { // for each item on table do this
            var pricelist;
    
            frappe.call({
                method: "frappe.client.get_list",
                args: {
                    doctype: "Item Price",
                    filters: [
                        ['price_list', "=", "Standard Selling"],
                        ["item_code", "=", v.item_code],
                    ],
                    fields: [

                        "price_list_rate",
                        "name"

                    ]
                },
                callback: function(r) { // do this to found price list doc
                    pricelist = (r.message[0].price_list_rate);
                    v.standard_rate = pricelist;
                    frappe.model.set_value(i, v, "standard_rate", pricelist);
                }
            });
        })

put this on validate and voila !and then just add the custom field along side the actual rate field in the print format !

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