Match multiple `FieldDecl` inside a `CXXRecordDecl`

Question

I am trying to capture all structs that look like:

struct Obj1 {
  int field1;
  double field2;

  template <typename Ar>
  void serialize(Ar& ar) {
    ::serializer(ar, field1, field2);
  }
};

I would like to match all structs with a template <typename Ar> void serialize(Ar& ar) method, and then collect the class FieldDecls to some place. I am currently using the following match (in clang-query):

cxxRecordDecl( has( functionTemplateDecl( has( templateTypeParmDecl() ), has( cxxMethodDecl( hasName("serialize"), parameterCountIs(1) ) ) ) ) )

and it seems if I do a fieldDecl inside cxxRecordDecl with bind would capture one and only one field. What if I want all field1, field2 and potentially fieldN?