The first time you run Airflow, it will create a file called airflow.cfg inyour $AIRFLOW_HOME directory (/airflow by default). This file contains Airflow's configuration and youcan edit it to change any of the settings. You can also set options with environment variables by using this format:AIRFLOW__SECTION__KEY (note the double underscores).
The config options must follow the config prefix naming convention defined within the secrets backend. This means that sql_alchemy_conn is not defined with a connection prefix, but with config prefix. For example it should be named as airflow/config/sql_alchemy_conn
Hvh Airflow Cfg