I have problems adding a RealmObject that contains a RealmList of LatLng

I know I need to extend RealmObject on all the objects that I have in realm, in order to create the database, but I use google maps and so I have a list of LatLng's in a object that I need to store in Realm. The LatLng is a google maps class, so I do not have access to the .java file, so I cannot create a copy of that object that extends RealmObject. Has anybody found a workaround this issue, is it possible?