Woocommerce- Add custom field to “customer details” block in order email

Question: How can we add custom field to “customer details” block in order email?
Answer: Using below code/filter, we can  add custom field to “customer details” block in order email

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/**  * Add custom fields to emails  */ add_filter('woocommerce_email_customer_details_fields', 'my_checkout_field_order_meta_fields', 40, 3 ); function my_checkout_field_order_meta_fields( $fields, $sent_to_admin, $order ) {   $fields['custom_field_1'] = array(     'label' => __( 'Vælg og bekræft din biltype' ),     'value' => get_post_meta( $order->id, 'Vælg og bekræft din biltype', true ),   );   $fields['custom_field_2'] = array(     'label' => __( 'Afgivet bestilling' ),     'value' => get_post_meta( $order->id, 'Afgivet bestilling', true ),   );         return $fields; }