Can't write a query with 2 facets?

Question

Database

In the database, each document has a city field and a country field,
I make a request facet.field=city&facet=on
and get

"facet_counts":{
    "facet_queries":{},
    "facet_fields":{
      "property__city__string":[
        "Chennai",2,
        "Riyadh",2,
        "Bogota",1,
        "Bucharest",1,
        "Chambery",1,
        "Dax",1,

but I also need to group it by country
in order to know which city belongs to which country,
I don’t need faceted search here,
I just asked Google how to make distinct and found such a solution