Specifying temp_dataset for BigQueryExampleGen

Our issue is similar to this we do not want to provide create and delete permission for dataset help only option is to pre specify the temp dataset , where the underlying beam support temp_dataset argument but tfx has no way to pass it thus i stumped upon custom_config bit and tried various options but it always errors. I am struggling to find right implementation to this because specifiy the temp dataset in any format in the custom config is throught error or not recognizing it