Doc - Merge print images from an URL

Hi community

Currently i have a customer using PDF´s Templetes, nevertheless we had try move the PDF templete to Document Merge but when we try read an URL where we insert the image location we don´t know if is possible to rendering the images inside the document merge from an URL.

In adition i am using the follow code inside the PDF manager:

{if $fields.os_firma_Cliente_c==""}{elseif $fields.os_firma_Cliente_c!=""}<img style="border: 0; margin: 0px;" src="{$fields.os_firma_cliente_c}" alt="" width="400" height="100" />{/if}</p>
<p style="text-align: center;">Nombre y Firma :</p>

In comparison with Document Merge the documentation is like this,.


{#module} {if os_cliente_co==""} {fieldname2} {elseif os_cliente_co=="value2"} {fieldname3} {else} {endif} {/module}

I can´t find how to do it.
¿Is possible rendering the URL´s inside the document merge?
I apprecite your comments and advices.

Regards