I have a 2021 Job 1. My dealer installed the BCM update last year, and that enabled the frunk. No button in FordPass but the keypad on the doorpost works, and the button inside the frunk works although I don't know why/how you could use that (and it posts a warning on the screen if you do hit it).
Then I enabled the frunk button in the control screen using FORscan.
So all I'm missing is the FordPass button, which would be the most useful method!
I use the frunk for takeout food
And if you see anyone say that 2021 Job 1 cars don't have the hardware, they are wrong. All cars have the hardware - it's the same mechanism required to pop the frunk in an emergency (if the 12V battery fails).