You may do it easily using include feature. The basic idea is to automaticaly include in a list email of list owners from Sympa database. Create a list and edit list config :
Then create a new SQL source according to the following screnshot :
The included source is an SQL query of emails from Sympa internal database. The SELECT close can be limited to a particular robot or to one of the roles list owners or:and list editors.
SELECT user_admin FROM admin_table WHERE robot_admin = 'renater.fr' and role_admin = 'owner'