How to combine multi stream

[fearfate]

I want to sync the table in google bigquery and do some convertion to the parquet file and store them to a patch of new file. However, considering the usage generated by querying and downloading, I would like to keep the individual stream simple (dividing it into two streams: downloading to the local machine and storing the converted data in a new file) instead of completing all the tasks in a single stream. How should I proceed?

input:
  label: "bigquery_package_versions"
  sequence:
    inputs:
    - gcp_bigquery_select:
        project: xxxxx
        table: bigquery-public-data.deps_dev_v1.PackageVersions
        columns:
        - "*"
        where:  SnapshotAt >= ? AND SnapshotAt < ? # No default (optional)
        auto_replay_nacks: true
        # job_labels: {}
        # priority: ""
        args_mapping: |
          root = ["2024-09-30", "2024-10-07"]
        prefix: |
          EXPORT DATA OPTIONS(
            uri='gs://ysdb-asia-east-1/package_versions/2024-09-30/*.parquet',
            format='parquet',
            compression='zstd',
            overwrite=true) AS
        suffix: |
          ORDER BY System asc, Name asc
    - gcp_cloud_storage:
        bucket: ysdb-asia-east-1
        prefix: package_versions
        delete_objects: true
# parquet_decode, mapping, parquet_encode process
output:
  file:
    path: ${YSDB_WORKER_DATA_HOME:/opt/ysdb_worker/data}/${! meta("gcs_key") }
    codec: all-bytes