How to automatically generate fields in Firebase Cloudfirestorage

Question

I am using Firebase database 'Cloudfirestore', I wonder if it is possible to save the fields automatically, so when adding any new item, do not need to write the name of each field and the value. If not possible, what do you tell me to add any new data? I believe I can use the same credentials in some other application just to add new data, but I’m in doubt.