Flying MIA-BOS-JFK-HKG in First, JFK-HKG leg in CX First.

I know I have access to Flagship First dining at JFK. (Done it many times.) And I will have access to the FL in Miami (if open). My question is, assuming Miami Flagship Lounge & Dining are open in December... Will I have access to Flagship Dining in Miami before the MIA-BOS flight?

(Grabbing a real meal in FFD vs airplane is preferred.) It is really not a big deal to me, just curious about policy. (I can also grab food at the Corona Bar & Grill via PP.)

The only current comparison I could think of would be if someone did JFK-ORD-INTL First on AA/CX.

Thoughts?