With PERF-4199 a new way to configure the variants was introduced. To add additional mongo_config parameters one can add a config_params_json to the system_perf.yml files. This json is then used to add additional setParameter attributes to the variant setup. 

With SERVER-78658 the CQF relevant variants were already adjusted to leverage a baseline mongodb_setup and set the parameters with the expansion. This ticket should cover the same work for QeuryStats to reduce the number of mongodb_setup files in the DSI repository and ease the implementation of new variants.