Load "Full load" as well as CDC (change data capture) in GCS buckets

Hi guys , so I want load entire Mongodb database (full load) into GCS (Google cloud storage) in json or parquet files and once the full load is done , I want to capture the CDC (change data capture) and load it into gcs for each collection. This is similar to what AWS DMS service. But I want to do this in GCP and AWS DMS does not support GCS storage. How do I achieve this ?