I know this isn’t 100% what you’re looking for but I use the Fitbit App (downloaded on Google Play or iStore) to track my calories. You can scan barcodes of food and it will bring up all its information. From there I also use the MMM-Fitbit module (https://github.com/SVendittelli/MMM-fitbit) to display that information (and more) on my mirror.
Sure you need a fitbit for half of this to work(Fitbit app works without a fitbit), but it is another solution if you dont find anything else.