How to map a dynamic JSON property to a fixed POJO field

I have some json that i want to parse into pojo

{
  "groups": [
    {
      "g1": [
        1,2,5,6,7
      ]
    },
    {
      "g2": [
        2,3,48,79
      ]
    }
  ]
}   

Of course, "g1" and "g1" are the identifiers, so what i would imagine as pojos would be sth like

class Container {
    List<Group> groups;
}

class Group {
    String id;
    List<Integer> values;
}

So it boils down to this question: How to use jackson to map a json-property to the pojo?