You can actually request MET values from the Fitbit API for your personal account.
See this github repo for instructions on setting up a google spreadsheet doc to get data. You may have to do some adjustments to get the MET values as they come from the /activities end point (I think).
Keep in mind that if you request MET values from the Fitbit API that they come with no decimal place, so a record of 10 is actually 1.0 (which is typical for sleeping).
You can learn more about the intraday data Fitbit provides here.
Here's a quick example plot of my METs (also from a Charge 2) for last week.