Quarkus outbox pattern with Debezium: how to add a custom column to outbox table

I am using Debezium for implementing outbox pattern on Quarkus (v 2.3.0 Final) and it works fine! I added a custom string column to my outbox table (on a Postgres DB) but when I call event.fire, the string value is not persisted. I have found this property table.fields.additional.placement in Debezium configuration but I can not understand how to use it in Quarkus application.properties. Is there anyone able to help me? Thanks in advance

The option table.fields.additional.placement is used for configuring the event routing SMT, it's not an option of the Quarkus outbox extension. It looks indeed as if you cannot have additional columns in your outbox table when using that extension currently. I have logged this request via DBZ-4317. Any feedback and contributions for implementing this will be very welcomed.