You want to add a new type of facet which isn't currently supported by Searchkit. First create a Facet Class by implementing the BaseFacet interface.
Then add a Facet type to the schema
then you should be able to query for facet + see filters applied in summary
If you want to see the query thats being requested to Elasticsearch, use the
DEBUG_MODE=true environment variable to log the query at every request. see Debug Logging