I wouldn't worry about V02 max. It's basically good for bragging rights. You don't train off it. You've got power data, and that's what you need to train.
Also a calculated V02max is likely not to be terribly accurate.
Back in the day, when I didn't have a power meter, and had a sponsor that paid for lab testing I got V02max done in a lab. Never used the data for anything. Ever since I got a power meter, I haven't bothered with lab testing. It would seem to me, a calculated approximation for V02 max would be even less useful.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.