Unable to use t-field in odoo web view

I'm trying to create a web gallery inside odoo.

I'm unable to use the t-field tag in the view even if t-esc works.

Following my template:

<t t-name="MediaElements">
    <div t-foreach="records" t-as="o" class="col-md-2">        
        <span t-field="o.stream" t-field-options="{'widget': 'image'}" />
    </div>
</t>

And my JS:

this.alive(model.query(['stream', 'scope']).filter().all()).then(function (records) {
    console.log(records);
    self.$('#media-elements').append(QWeb.render("MediaElements", {records: records}));
});

If I use t-esc all things goes well, but I don't know how to display images stream (base64).

Any hints?

Thanks.