You can use an UBAQ Post Processing on GetList like this and you’ll get the image in your Calculated_Field then you can use that in SSRS to render the image.
Func ByteToString = (bytes) =>
{
return Convert.ToBase64String(bytes);
};
foreach(var y in ttResults)
{
var arr= (from x in Db.FileStore where x.FileName == y.Part_ImageID select x.Content).FirstOrDefault();
if(arr!=null)
y.Calculated_ImageStore = ByteToString(arr);
}