Use of JSON with ESP8266

Hello All,

I need some help to guide me in setting up my new project. I'm going to use a WEMOS D1 ESP8266 to get temperature and humidity measurements using DHT22 sensor. The idea is to use an JSON file on a Fritzbox NAS wich is updated with the new data from the ESP8266 via Wifi.
My question is, since I would like to store a lot of data over time is there a way to save new data to the JSON file on the NAS media server without handling the complete JSON file on the ESP8266 board? I have not found any help on how to add ne values to an existing JSON file stored not on the ESP8266 board. The data should get transferred to the NAS storage via FTP.
I know it's a very superficial question but are there any links or comments to guid me?
Thanks a lot!

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