In Bangladesh, Grameenphone E-sim is supported by the USA variant iPhone 14 series?

CDMA is pretty much dead and no longer an issue and most iPhones since iPhone 7 match either.

What is important is if your carrier supports eSIM. If they do it will work but remember that you will not have a physical SIM slot and for hardware service you will have to return to the USA.

Honestly, I'm not sure.

One thing I can say is this. AT&T unlocked phones match any GSM carrier.

Verizon unlocked phones matches CDMA standard.

If Grameenphone E-sim supports either GSM or CDMA, you'll want the equivalent unlocked carrrier from the U.S. to fit the SIM.

Locked to a specific carrier, you may be stuck with the carrier's roaming charges and their SIM for actual setup.