I was looking up in the Sefaria, but the only reference to the Dinah Demalchutah I could find was in the Babylonian Talmud in the name of the Babylonian Amorah Shmuel (דינא דמלכותא) and only in his name. It does not seem to appear in the Jerusalem Talmud.
Is there a Tannaic source for this fundamental Halachic principle?