How to pass images in field

[brain2xml]

Images I uploaded from widget stored in db and back with ajax json. That json generates download form.

Can I add by hand image to widget?

<?php
$imagesList = [
[
'name' => 'somename'
'thrumbunal' =>'some/url'
]
];

<?= FileUploadUI::widget([
        'name' => 'picture_upload',
        'url' => ['file/upload'],
        'gallery' => false,

where to put $imagesList to initialize it?