JSon deserialisation with UI Flow

[Camper_Friend]

Good day
I want an Arduino Nano and the M5Stack Core2 to communicate with each other via the serial port and the json protocol. Unfortunately, I can't find the appropriate blocks in UI Flow to decode the message sent by the Nano.

This message is sent:

{
}, "sensor": "gps",
"time": 1351824120,
"data": [
48.756080,
2.302038
]
}

Here is my attempt to decode the message:

Thanks for your help!