Custom Labels in Vertex AI Pipeline PipelineJobSchedule

I would like to know the steps involved in adding custom labels to a Vertex AI pipeline’s PipelineJobSchedule. Can anyone please provide me with the necessary guidance as it's not working when I am adding inside the Pipelinejob parameters?

# https://cloud.google.com/vertex-ai/docs/pipelines/schedule-pipeline-run#create-a-schedule
pipeline_job = aiplatform.PipelineJob(
  template_path="COMPILED_PIPELINE_PATH",
  pipeline_root="PIPELINE_ROOT_PATH",
  display_name="DISPLAY_NAME",
  labels="{"name":"test_xx"}"
)
pipeline_job_schedule = aiplatform.PipelineJobSchedule(
  pipeline_job=pipeline_job,
  display_name="SCHEDULE_NAME"
)

pipeline_job_schedule.create(
  cron="TZ=CRON",
  max_concurrent_run_count=MAX_CONCURRENT_RUN_COUNT,
  max_run_count=MAX_RUN_COUNT,
)

from Custom Labels in Vertex AI Pipeline PipelineJobSchedule