INCLUDE

Includes all records from a given domain

dnsconfig.js

D("example.com!external", REGISTRAR, DnsProvider(R53),
  A("test", "8.8.8.8")
);

D("example.com!internal", REGISTRAR, DnsProvider(R53),
  INCLUDE("example.com!external"),
  A("home", "127.0.0.1")
);