Is it possible to orchestrate snowflake Notebook Job?

Question

I have 3 note book created for different data operation . I want to orchestrate the notebook execution as per below flow

Execute Notebook 1

Execute Notebook2

Execute Notebook3

Based on certain flag in Notebook1, either Notebook2 or Notebook3 should be executed.

i found below example from the document using DAG

with DAG("mydag", schedule=timedelta(days=1), warehouse="my_warehouse_name") as dag:
    dag_task1 = DAGTask("LOAD_EXCEL_FILES_TASK", definition=f'''EXECUTE NOTEBOOK "{database_name}"."{schema_name}"."{env}_06_load_excel_files"()''', warehouse=warehouse_name)
    dag_task2 = DAGTask("LOAD_DAILY_CITY_METRICS", definition=f'''EXECUTE NOTEBOOK "{database_name}"."{schema_name}"."{env}_07_load_daily_city_metrics"()''', warehouse=warehouse_name)

    # Define the dependencies between the tasks
    dag_task1 >> dag_task2 # dag_task1 is a predecessor of dag_task2

# Create the DAG in Snowflake
dag_op.deploy(dag, mode="orreplace")

but when i execute with above example, it throwing syntax error

Unexpected '='

i also want to know if there any option run this notebook job parallel..

i mean, reducing number of task. so how to achieve such scenario within Snowflake?