我最终使用以下代码实现了它：

我使用一个php类来创建一个有组织的工作流，所以不必介意public 关于函数。。。

首先，我像这样注册我的过滤器：

public function registerFilters()
{
    add_filter( \'woocommerce_default_address_fields\', array($this, \'woo_new_default_address_fields\'), 10, 2);
    add_filter(\'woocommerce_order_formatted_billing_address\', array($this, \'woo_custom_order_formatted_billing_address\'), 10, 2);
    add_filter(\'woocommerce_formatted_address_replacements\', array($this, \'myFunction\'), 10, 2);
    add_filter(\'woocommerce_localisation_address_formats\', array($this, \'mySecondFunction\'), 10, 2);

    return $this;
}

使用此功能，我可以添加/注册自定义字段，使其在默认情况下成为自定义字段，这样它将在插件部分以紫色字母显示（如页面顶部的屏幕截图所示）：

public function woo_new_default_address_fields($fields)
{
    $fields[\'colonia\'] = array(

        \'label\' => __( \'Colonia\', \'woocommerce\' ),
        \'class\' => array( \'form-row-wide\' ),

    );
    $fields[\'num_int\'] = array(

        \'label\' => __( \'Num. Interior\', \'woocommerce\' ),
        \'class\' => array( \'form-row-wide\' ),

    );
    $fields[\'num_ext\'] = array(

        \'label\' => __( \'Num. Exterior\', \'woocommerce\' ),
        \'class\' => array( \'form-row-wide\' ),

    );
    $fields[\'municipio\'] = array(

        \'label\' => __( \'Municipio\', \'woocommerce\' ),
        \'class\' => array( \'form-row-wide\' ),

    );
    $fields[\'reference\'] = array(

        \'label\' => __( \'Referencias\', \'woocommerce\' ),
        \'class\' => array( \'form-row-wide\' ),

    );

    $order = array(
        "first_name",
        "last_name",
        "colonia",
        "num_int",
        "num_ext",
        "municipio",
        "reference",
        "company",
        "country",
        "address_1",
        "address_2",
        "city",
        "state",
        "postcode"
    );

    foreach($order as $field) {

        $ordered_fields[$field] = $fields[$field];

    }

    $fields = $ordered_fields;

    return $fields;
}

然后我将它们添加到电子邮件的格式化帐单地址：

public function woo_custom_order_formatted_billing_address( $address , $WC_Order )
{

    $address = array(
        \'first_name\'    => \'Nombre: \' . $WC_Order->billing_first_name . \' \' . $address[\'last_name\'],
        \'address_1\'     => \'Dirección: \' . $WC_Order->billing_address_1,
        \'colonia\'     => \'Colonia: \' . $WC_Order->billing_colonia,
        \'num_ext\'       => \'Num. Exterior: \' . $WC_Order->billing_num_ext,
        \'num_int\'       => \'Num. Interior: \' . $WC_Order->billing_num_int,
        \'reference\'     => \'Referencias: \' . $WC_Order->billing_reference,
        \'city\'          => \'Ciudad: \' . $WC_Order->billing_city,
        \'state\'         => \'Estado: \' . $WC_Order->billing_state,
        \'municipio\'     => \'Municipio: \' . $WC_Order->billing_municipio,
        \'postcode\'      => \'Código Postal: \' . $WC_Order->billing_postcode,


    );

    return $address;

}

在此，我将我的自定义字段替换/添加到地址中，以便在格式化的帐单地址上使用这些字段：

public function myFunction( $address, $args )
{
    $address[\'{colonia}\'] = $args[\'colonia\'];
    $address[\'{num_int}\'] = $args[\'num_int\'];
    $address[\'{num_ext}\'] = $args[\'num_ext\'];
    $address[\'{municipio}\'] = $args[\'municipio\'];
    $address[\'{reference}\'] = $args[\'reference\'];
    return $address;
}

然后，我将替换/添加它们，并说明其显示方式：

public function mySecondFunction($formats)
{
    foreach($formats as $key => $value) :
        $formats[$key] .= "\\n\\n{colonia}";
        $formats[$key] .= "\\n\\n{num_int}";
        $formats[$key] .= "\\n\\n{num_ext}";
        $formats[$key] .= "\\n\\n{municipio}";
        $formats[$key] .= "\\n\\n{reference}";
    endforeach;

    return $formats;
}

我希望你们都能理解我，我不是专家：）