How to access custom fields in inventory to display in Quotation

I have created some custom fields in inventory item.
i want to access that custom fields by name and display values on quotation.
i got access by cell values like this:

{% for row in table.rows %}
            <tr>
                <td style="padding: 5px 10px; text-align: center; border-left-width: 1px; width: 1px">{{ forloop.index0 | plus:1 }}</td>
            <td style="padding: 5px 10px; text-align: left; border-left-width: 1px; border-right-width: 1px; white-space: nowrap; width: 80px">
                <i><b>{{ row.cells[1].text}}{{"   "}}</b></i>
                {{ row.cells[2].text}}<br><br>

how i can get value by column name.

You will not be able to access them unless those custom fields are marked to show on printed documents.

And once you do that, you don’t have to customize your theme, they will show automatically in all built-in themes.