Hello @Memsplace and welcome to the Community. That feature isn't available in the Fitbit app.
I moved your post to the Healthy Eating forum, a better fit for your question. There are apps that can estimate the calories from a picture. Perhaps another user is aware of one that can sync with Fitbit.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.