The list of default logs is in the module. Make it an array in module data so it will be easier for users to update. They can just cut and paste the list into their hiera data and edit.
Do this for any of the arrays or settings in the module you think will be helpful.
Person who requested this feature wants it in simp_config_settings.yaml not the module's data so they can rewrite simp-simp_rsyslog (their own implementation) but still use the default value for simp_rsyslg::default_logs in their new class.