I tried to deploy a simple function:
CloudDeploy@Delayed@ExportForm["??????!","PNG"]

but it did not give the desired result. I tried to use:
SetOptions[$CharacterEncoding, CharacterEncoding -> "UTF8"];
$CharacterEncoding="UTF8";
and
ExportForm["??????!",{"PNG", CharacterEncoding->"UTF8"}]
Unfortunately, nothing helped. Tell me, please, how to fix it?