Nope. The 'Return to Ivalice' raids are simply fanservice, they're not the FFXII/FFT Ivalice plonked in Hydaelyn (or the player visiting the FFXII/FFT Ivalice), but just Hydaelyn-specific areas in the Far East that reuse certain character names, monsters and places from those games (just like the Crystal Tower raids not being FFIII's final dungeon, Gold Saucer not being the same one from FFVII etc).

And there is nothing like the Gambit system here, unless you regard macros as gambits (which you can sort of do by setting wait timers on them to execute). But that's a real stretch I'm afraid. And I don't see SE adding things like that, as they're pretty dead-set against automating combat abilities (as that goes into dangerous territory - i.e. botting, so I'll just leave it there).