db_schema.xml

<?xml version="1.0"?>
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
    <table name="quote" resource="default" engine="innodb">
        <column xsi:type="text" name="suburb" nullable="true" comment="Delivery suburb"/>
        <column xsi:type="text" name="service_code" nullable="true" comment="Shipping Service Code"/>
        <column xsi:type="text" name="delivery_note" nullable="true" comment="Delivery Note"/>
    </table>
    <table name="sales_order" resource="default" engine="innodb">
        <column xsi:type="text" name="suburb" nullable="true" comment="Delivery Suburb"/>
        <column xsi:type="text" name="service_code" nullable="true" comment="Shipping Service Code"/>
        <column xsi:type="text" name="delivery_note" nullable="true" comment="Delivery Note"/>
    </table>
    <table name="customer_address_entity" resource="default" engine="innodb">
        <column xsi:type="text" name="suburb" nullable="true" comment="Customer Suburb"/>
        <column xsi:type="text" name="service_code" nullable="true" comment="Shipping Service Code"/>
        <column xsi:type="text" name="delivery_note" nullable="true" comment="Delivery Note"/>
    </table>

</schema>