You would just divide your ftp by that amount. For example, if you live at 8000ft (acclimated) and have a ftp of 300, then your estimated sea level ftp would be 300 / 0.886 = 338.
When you live at sea level, your body will lose the physiological adaptations it made it live at elevation (less red blood cells, I think). This would have your 338 reduced over time. However, I don’t think it would go all the way back to 300 because there is just less oxygen at 8000ft and your body cannot fully acclimate to it as if it was at sea level.
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