CheckAndMutate when using CloudBigtableIO in Apache Beam pipeline

The example provided in [Dataflow Connector for Bigtable](https://cloud.google.com/bigtable/docs/hbase-dataflow-java) only show how to write `Put` object to Bigtable. Now I need to send a conditional write request, which checks a row for a condition and then, depending on the result, writes data to that row - smt like [this](https://cloud.google.com/bigtable/docs/writing-data#conditional) but in the context of Dataflow connector. I checked the HBase client library but there is no obvious way to achieve the same thing. Any suggestion?