Custom fields with html in email

Hello,

Sorry for language mistakes.
I want to put in an email a custom fields. Following the advice on the site woocommerce docs
link.

i put custom fields on email by code:

add_filter('woocommerce_email_order_meta_keys', 'my_custom_order_meta_keys');

function my_custom_order_meta_keys( $keys ) {
     $keys[] = 'Field1';
     $keys[] = 'Field2';
     $keys[] = 'Field3';

     return $keys;
}

In email i saw

Field1: value1
Field2: value2
Field3: value3

Is it possible put between fields Field1 and Field2 for example html text. For example

Field1: value1
<h2>Some html text </h2>
Field2: value2
Field3: value3

Thanks
Zbynek