How to insert jsonobject to firebase

I got that error(pic 1) after putting like this (pic 2) any ideas how to actually do this?, I want to transfer subtag values from one tag to another and deleting the original tag, Thanks

Show an example of the json / json object you are working with

if im not mistaken, tinydb is a json object correct?, so i’ve stored values in the tinytb that is related to firebase db, i want to call the firebasedb values within the tinydb value tag, do you understand?. Basicly, i was making an account system with firebasedb and tinydb.