Can EmailPreSend send an array of values with mergefield?

[Sam_lee]

I want to send an email Template that shows all the domains a client has , My template is custom made and in General field,I am trying to get the values with this code:

<?php

 

use WHMCS\Database\Capsule;

 

add_hook('EmailPreSend', 1, function($vars) {

if($vars['messagename'] == 'New Network Issue') {

$merge_fields = [];

$merge_fields['service_domain'] = Capsule::table('tblhosting')

->where('userid', $vars['relid'])

->where('server', '41')

->where('domainstatus','Active')

->get();

return $merge_fields;

}

});