i_will_trigger.py

import pendulum
from airflow import DAG
from airflow.operators.trigger_dagrun import TriggerDagRunOperator


dag = DAG(
    dag_id='i_will_trigger',
    schedule_interval=None,
    start_date=pendulum.parse('2022-07-13'),
)

task = TriggerDagRunOperator(
    task_id='run_me',
    trigger_dag_id='triggable',
    conf={'hello': 'goodbye'},
    dag=dag,
)

triggable_dag.py

import pendulum
from airflow import DAG
from airflow.operators.bash import BashOperator


dag = DAG(
    dag_id='triggable',
    params={'hello': 'there'},
    schedule_interval=None,
    start_date=pendulum.parse('2022-07-13')
)

task = BashOperator(task_id='aaa', dag=dag, bash_command='echo {{ params.hello }}')

log excerpt