用于将HLL_COUNT.INIT导入BigQuery的Google DataFlow API

I am sending data to PubSub from where I am trying to create a DataFlow job to put data into BigQuery. I have a column in the data for unique that I want to do HLL_COUNT.INIT Is there an equivalent method on the DataFlow side so that I can directly store the HLL version of the column in BigQuery?I am sending data to PubSub from where I am try