It is indeed an option.
Straightforward to do, but ya has to pay I’m afraid.
Go on to the BMW connect, then to ‘hub’.
You’ll see what your vin number has linked to it, but I’d call them just to verify what you do, and don’t have subscription-wise.
They made a mistake with me, then came back shortly after.
Once subscribed to, and it’s had a good shot at a data connection, usually two hours-ish, it’ll be there.
(There will possibly be a message, and or, as you delete the iPhone already on, re-instate it, and for me, it miraculously appeared in phone settings on the display of the i3. You’ll see it at the far left, just about 1/3 up from the bottom if you have it).
You then select it in settings. You’ll see a check box for Apple car play there.
Exit to menu. Turn the dial as far left as you can, and there’s a small side eminating tab, enter on that, then it appears.
Your iPhone has a few settings you’ll need to tweek too, but yes, Dec 18 94Ah Rex, and mine works well.